BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/o Vacuum Brake Booster): C1380; Stop Light Control Relay Malfunction; 2020 - 2021 MY RAV4 RAV4 HV [10/2019

Last Modified: 01-30-2024	6.11:8.1.0	Doc ID: RM100000001KJOU
Model Year Start: 2020	Model: RAV4	Prod Date Range: [10/2019 - 12/2021]
Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (w/o Vacuum Brake Booster): C1380; Stop Light Control Relay Malfunction; 2020 - 2021 MY RAV4 RAV4 HV [10/2019 - 12/2021]

DTC

C1380

Stop Light Control Relay Malfunction

DESCRIPTION

When any of the following conditions are met, the skid control ECU (brake booster with master cylinder assembly) sets the drive output (STPO) ON which operates the stop light control relay (stop light switch assembly) and turns on the stop lights.

Illumination Conditions:

Pre-collision brake is operating.*
The dynamic radar cruise control system is operating and is applying the brakes.*
Secondary collision brake is operating.
Brake hold is operating.
The parking brake is engaged while the vehicle is being driven.

*: w/ Pre-collision System

DTC No.

Detection Item

INF Code

DTC Detection Condition

Trouble Area

Note

C1380

Stop Light Control Relay Malfunction

761

762

INF Code: 761
- When the voltage at terminal IG1 is 9.5 V higher than, stop light drive output (STPO) is ON and STP is OFF for 2 seconds or more.

INF Code: 762
- When the voltage at terminal IG1 is 9.5 V higher than, stop light drive output (STPO) is OFF and the input signals for STP and STP2 differ for 5 seconds or more.

Stop light switch assembly circuit
Stop light switch assembly
Skid control ECU (Brake booster with master cylinder assembly)
Hybrid vehicle control ECU assembly
Certification ECU (smart key ECU assembly)
Rear combination light socket and wire LH
Rear combination light socket and wire RH
Rear combination light LED
Stop light LED
Center stop light cord assembly
Center stop light assembly
Open or short in wire harness

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

When replacing the skid control ECU (brake booster with master cylinder assembly), perform initialization and calibration of the linear solenoid valve.
Click here

Click here
Inspect the fuses for circuits related to this system before performing the following procedure.
If the certification ECU (smart key ECU assembly) is replaced, refer to Registration.
Click here

HINT:

When C1249 is output together with C1380, inspect and repair the trouble areas indicated by C1249 first.

Click here

PROCEDURE

1.	CHECK HARNESS AND CONNECTOR (STP, STPO AND STP2 TERMINAL)

(a) Turn the ignition switch off.

*a	Front view of wire harness connector (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

(b) Make sure that there is no looseness at the locking part and the connecting part of the connector.

(d) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
A42-33 (STP) - Body ground	Stop light switch assembly on (Brake pedal depressed)	11 to 14 V
A42-33 (STP) - Body ground	Stop light switch assembly off (Brake pedal released)	Below 1.5 V
A42-3 (STPO) - Body ground	Always	11 to 14 V
A42-6 (STP2) - Body ground	Stop light switch assembly on (Brake pedal depressed)	11 to 14 V
A42-6 (STP2) - Body ground	Stop light switch assembly off (Brake pedal released)	Below 1.5 V

Result	Proceed to
All terminal voltages are normal.	A
Only STP2 terminal voltage abnormal.	B
Only STPO terminal voltage abnormal.	C
Only STP terminal voltage abnormal. (w/ Side Marker)	D
Only STP terminal voltage abnormal. (w/o Side Marker)	E
STPO terminal and STP terminal voltage abnormal.	F

2.	PERFORM ACTIVE TEST USING TECHSTREAM (STOP LIGHT RELAY)

(a) Reconnect the A42 skid control ECU (brake booster with master cylinder assembly) connector.

(b) Select the Active Test on the Techstream.

Click here

Chassis > ABS/VSC/TRAC > Active Test

Tester Display	Measurement Item	Control Range	Diagnostic Note
Stop Light Relay	Stop light switch assembly (stop light control relay)	Stop light switch assembly (Relay) ON/OFF	Stop lights come on

Chassis > ABS/VSC/TRAC > Active Test

Tester Display
Stop Light Relay

OK:

Stop lights turn on/off in accordance with the Active Test.

GO TO STEP 4

3.	RECONFIRM DTC

(a) Clear the DTCs.

Click here

Chassis > ABS/VSC/TRAC > Clear DTCs

(b) Select the Active Test on the Techstream.

Click here

Chassis > ABS/VSC/TRAC > Active Test

Tester Display	Measurement Item	Control Range	Diagnostic Note
Stop Light Relay	Stop light switch assembly (stop light control relay)	Stop light switch assembly (Relay) ON/OFF	Stop lights come on

Chassis > ABS/VSC/TRAC > Active Test

Tester Display
Stop Light Relay

(d) Check if the same DTC is output.

Click here

Chassis > ABS/VSC/TRAC > Trouble Codes

Result	Proceed to
DTC C1380 is output.	A
DTC C1380 is not output.	B

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY

USE SIMULATION METHOD TO CHECK

4.	INSPECT BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY

(a) Select the Active Test on the Techstream.

Click here

Chassis > ABS/VSC/TRAC > Active Test

Tester Display	Measurement Item	Control Range	Diagnostic Note
Stop Light Relay	Stop light switch assembly (stop light control relay)	Stop light switch assembly (Relay) ON/OFF	Stop lights come on

Chassis > ABS/VSC/TRAC > Active Test

Tester Display
Stop Light Relay

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
A40-4 (ACC) - Body ground	Active Test is on	1.5 V or less

*a	Component with harness connected (Stop Light Switch Assembly)

REPLACE STOP LIGHT SWITCH ASSEMBLY

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY

5.	CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - HYBRID VEHICLE CONTROL ECU ASSEMBLY)

(a) Disconnect the A29 hybrid vehicle control ECU assembly connector.

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
A42-6 (STP2) - Body ground	Stop light switch assembly on (Brake pedal depressed)	11 to 14 V
A42-6 (STP2) - Body ground	Stop light switch assembly off (Brake pedal released)	Below 1.5 V

*a	Front view of wire harness connector (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY

6.	CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - SMART KEY ECU ASSEMBLY)

(a) Disconnect the M7 certification ECU (smart key ECU assembly) connector.

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
A42-6 (STP2) - Body ground	Stop light switch assembly on (Brake pedal depressed)	11 to 14 V
A42-6 (STP2) - Body ground	Stop light switch assembly off (Brake pedal released)	Below 1.5 V

*a	Front view of wire harness connector (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

REPLACE SMART KEY ECU ASSEMBLY

7.	CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - STOP LIGHT SWITCH ASSEMBLY)

(a) Disconnect the A40 stop light switch assembly connector.

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
A42-6 (STP2) - Body ground	Always	Below 1.5 V

*a	Front view of wire harness connector (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

REPAIR OR REPLACE HARNESS OR CONNECTOR

8.	CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - STOP LIGHT SWITCH ASSEMBLY)

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
A42-6 (STP2) - A40-3 (L)	Always	Below 1 Ω
A42-6 (STP2) or A40-3 (L) - Body ground	Always	10 kΩ or higher

REPLACE STOP LIGHT SWITCH ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

9.	CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - STOP LIGHT SWITCH ASSEMBLY)

(a) Disconnect the A40 stop light switch assembly connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
A42-3 (STPO) - A40-4 (ACC)	Always	Below 1 Ω

REPLACE STOP LIGHT SWITCH ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

10.	CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - REAR COMBINATION LIGHT SOCKET AND WIRE LH)

(a) Disconnect the N18 rear combination light socket and wire LH connector.

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
A42-33 (STP) - Body ground	Stop light switch assembly on (Brake pedal depressed)	11 to 14 V
A42-33 (STP) - Body ground	Stop light switch assembly off (Brake pedal released)	1.5 V or less

*a	Front view of wire harness connector (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

GO TO STEP 13

11.	CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - REAR COMBINATION LIGHT SOCKET AND WIRE LH)

(a) Reconnect the N18 rear combination light socket and wire LH connector.

(b) Disconnect the B stop light LED connector.

Standard Voltage:

Tester Connection	Condition	Specified Condition
A42-33 (STP) - Body ground	Stop light switch assembly on (Brake pedal depressed)	11 to 14 V
A42-33 (STP) - Body ground	Stop light switch assembly off (Brake pedal released)	1.5 V or less

*a	Front view of wire harness connector (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

REPLACE STOP LIGHT LED

12.	CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - REAR COMBINATION LIGHT SOCKET AND WIRE LH)

(a) Disconnect the A rear combination light LED connector.

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
A42-33 (STP) - Body ground	Stop light switch assembly on (Brake pedal depressed)	11 to 14 V
A42-33 (STP) - Body ground	Stop light switch assembly off (Brake pedal released)	1.5 V or less

*a	Front view of wire harness connector (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

REPLACE REAR COMBINATION LIGHT LED

REPLACE REAR COMBINATION LIGHT SOCKET AND WIRE LH

13.	CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - REAR COMBINATION LIGHT SOCKET AND WIRE RH)

(a) Disconnect the M14 rear combination light socket and wire RH connector.

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
A42-33 (STP) - Body ground	Stop light switch assembly on (Brake pedal depressed)	11 to 14 V
A42-33 (STP) - Body ground	Stop light switch assembly off (Brake pedal released)	1.5 V or less

*a	Front view of wire harness connector (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

GO TO STEP 16

14.	CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - REAR COMBINATION LIGHT SOCKET AND WIRE RH)

(a) Reconnect the M14 rear combination light socket and wire RH connector.

(b) Disconnect the D stop light LED connector.

Standard Voltage:

Tester Connection	Condition	Specified Condition
A42-33 (STP) - Body ground	Stop light switch assembly on (Brake pedal depressed)	11 to 14 V
A42-33 (STP) - Body ground	Stop light switch assembly off (Brake pedal released)	1.5 V or less

*a	Front view of wire harness connector (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

REPLACE STOP LIGHT LED

15.	CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - REAR COMBINATION LIGHT SOCKET AND WIRE RH)

(a) Disconnect the C rear combination light LED connector.

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
A42-33 (STP) - Body ground	Stop light switch assembly on (Brake pedal depressed)	11 to 14 V
A42-33 (STP) - Body ground	Stop light switch assembly off (Brake pedal released)	1.5 V or less

*a	Front view of wire harness connector (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

REPLACE REAR COMBINATION LIGHT LED

REPLACE REAR COMBINATION LIGHT SOCKET AND WIRE RH

16.	CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - CENTER STOP LIGHT ASSEMBLY)

(a) Disconnect the E center stop light assembly connector.

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
A42-33 (STP) - Body ground	Stop light switch assembly on (Brake pedal depressed)	11 to 14 V
A42-33 (STP) - Body ground	Stop light switch assembly off (Brake pedal released)	1.5 V or less

*a	Front view of wire harness connector (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

REPLACE CENTER STOP LIGHT ASSEMBLY

GO TO STEP 24

17.	CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - STOP LIGHT LED)

(a) Disconnect the A stop light LED connector.

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
A42-33 (STP) - Body ground	Stop light switch assembly on (Brake pedal depressed)	11 to 14 V
A42-33 (STP) - Body ground	Stop light switch assembly off (Brake pedal released)	1.5 V or less

*a	Front view of wire harness connector (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

REPLACE STOP LIGHT LED

18.	CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - REAR COMBINATION LIGHT SOCKET AND WIRE LH)

(a) Disconnect the N18 rear combination light socket and wire LH connector.

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
A42-33 (STP) - Body ground	Stop light switch assembly on (Brake pedal depressed)	11 to 14 V
A42-33 (STP) - Body ground	Stop light switch assembly off (Brake pedal released)	1.5 V or less

*a	Front view of wire harness connector (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

REPLACE REAR COMBINATION LIGHT SOCKET AND WIRE LH

19.	CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - STOP LIGHT LED)

(a) Disconnect the B stop light LED connector.

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
A42-33 (STP) - Body ground	Stop light switch assembly on (Brake pedal depressed)	11 to 14 V
A42-33 (STP) - Body ground	Stop light switch assembly off (Brake pedal released)	1.5 V or less

*a	Front view of wire harness connector (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

REPLACE STOP LIGHT LED

20.	CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - REAR COMBINATION LIGHT SOCKET AND WIRE RH)

(a) Disconnect the M14 rear combination light socket and wire RH connector.

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
A42-33 (STP) - Body ground	Stop light switch assembly on (Brake pedal depressed)	11 to 14 V
A42-33 (STP) - Body ground	Stop light switch assembly off (Brake pedal released)	1.5 V or less

*a	Front view of wire harness connector (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

REPLACE REAR COMBINATION LIGHT SOCKET AND WIRE RH

GO TO STEP 23

21.	CHECK STOP LIGHT SWITCH ASSEMBLY POWER SOURCE CIRCUIT

(a) Disconnect the A40 stop light switch assembly connector.

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
A40-7 (B) - Body ground	Always	11 to 14 V

*a	Front view of wire harness connector (to Stop Light Switch Assembly)

Standard Resistance:

Tester Connection	Condition	Specified Condition
A40-2 (GND) - Body ground	Always	Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR

22.	CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - STOP LIGHT SWITCH ASSEMBLY)

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
A42-3 (STPO) or A40-4 (ACC) - Body ground	Always	10 kΩ or higher

REPLACE STOP LIGHT SWITCH ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

23.	CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - CENTER STOP LIGHT ASSEMBLY)

(a) Disconnect the C center stop light assembly connector.

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
A42-33 (STP) - Body ground	Stop light switch assembly on (Brake pedal depressed)	11 to 14 V
A42-33 (STP) - Body ground	Stop light switch assembly off (Brake pedal released)	1.5 V or less

*a	Front view of wire harness connector (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

REPLACE CENTER STOP LIGHT ASSEMBLY

24.	CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - CENTER STOP LIGHT CORD ASSEMBLY)

(a) Disconnect the R1 center stop light cord assembly connector.

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
A42-33 (STP) - Body ground	Stop light switch assembly on (Brake pedal depressed)	11 to 14 V
A42-33 (STP) - Body ground	Stop light switch assembly off (Brake pedal released)	1.5 V or less

*a	Front view of wire harness connector (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

REPLACE CENTER STOP LIGHT CORD ASSEMBLY

25.	CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - STOP LIGHT SWITCH ASSEMBLY)

(a) Disconnect the A40 stop light switch assembly connector.

*a	Front view of wire harness connector (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
A42-33 (STP) - Body ground	Always	1.5 V or less

REPAIR OR REPLACE HARNESS OR CONNECTOR

26.	CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - STOP LIGHT SWITCH ASSEMBLY)

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
A40-1 (OUT) - A42-33 (STP)	Always	Below 1 Ω
A40-1 (OUT) or A42-33 (STP) - Body ground	Always	10 kΩ or higher

REPLACE STOP LIGHT SWITCH ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR