SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM (w/ Occupant Classification System): B1660; P Seat Airbag Active Mode Indicator; 2019 - 2020 MY RAV4 RAV4 HV [02/2019

Last Modified: 05-08-2025	6.11:8.1.0	Doc ID: RM100000001HIA9
Model Year Start: 2019	Model: RAV4	Prod Date Range: [02/2019 - 08/2020]
Title: SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM (w/ Occupant Classification System): B1660; P Seat Airbag Active Mode Indicator; 2019 - 2020 MY RAV4 RAV4 HV [02/2019 - 08/2020]

DTC

B1660

P Seat Airbag Active Mode Indicator

DESCRIPTION

The passenger airbag ON/OFF indicator circuit consists of the airbag ECU assembly and passenger airbag ON/OFF indicator.

The passenger airbag ON/OFF indicator indicates the operation condition of the instrument panel passenger without door airbag assembly.

DTC B1660 is stored when a malfunction is detected in the passenger airbag ON/OFF indicator circuit.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Warning Indicate	Test Mode / Check Mode
B1660	P Seat Airbag Active Mode Indicator	One of the following conditions is met: The airbag ECU assembly detects a line short, short to ground or B+, or an open in the passenger airbag ON/OFF indicator circuit. A passenger airbag ON/OFF indicator malfunction. An airbag ECU assembly malfunction.	Instrument panel wire Telltale light assembly (passenger airbag ON/OFF indicator) Airbag ECU assembly	Comes on	Not applicable

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal.
Click here
When disconnecting the cable from the negative (-) auxiliary battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected.
Click here
After replacing the airbag ECU assembly, refer to initialization.
Click here

PROCEDURE

1.	CHECK PASSENGER AIRBAG ON/OFF INDICATOR CONDITION

(a) Turn the ignition switch to ON.

(b) Check the passenger airbag ON/OFF indicator operation.

HINT:

Refer to the normal condition of the passenger airbag ON/OFF indicator.

Click here

Result	Proceed to
Passenger airbag ON/OFF indicator illumination is always on.	A
Passenger airbag ON/OFF indicator illumination is always off.	B

GO TO STEP 7

2.	CHECK CONNECTION OF CONNECTORS

(a) Turn the ignition switch off.

(b) Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 90 seconds.

The connectors are not properly connected

CONNECT CONNECTORS PROPERLY

The connectors are properly connected

3.	CHECK CONNECTORS

(a) Disconnect the connectors from the airbag ECU assembly and telltale light assembly.

*1	Telltale Light Assembly
*2	Airbag ECU Assembly
*3	Instrument Panel Wire

(b) Check that the connectors (on the airbag ECU assembly side and telltale light assembly side) are not damaged.

The connectors are deformed or damaged

REPLACE INSTRUMENT PANEL WIRE

The connectors are not deformed or damaged

4.	CHECK PASSENGER AIRBAG ON/OFF INDICATOR

(a) Connect the connector to the telltale light assembly.

(b) Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.

(d) Check the passenger airbag ON/OFF indicator operation.

The passenger airbag ON/OFF indicator comes on

GO TO STEP 6

The passenger airbag ON/OFF indicator does not come on

CHECK DTC

(a) Turn the ignition switch off.

*1	Telltale Light Assembly
*2	Airbag ECU Assembly

(b) Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 90 seconds.

(d) Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.

(e) Turn the ignition switch to ON, and wait for at least 60 seconds.

(f) Clear the DTCs stored in memory.

Click here

Body Electrical > SRS Airbag > Clear DTCs

(g) Turn the ignition switch off.

(h) Turn the ignition switch to ON, and wait for at least 60 seconds.

(i) Check for DTCs.

Click here

Body Electrical > SRS Airbag > Trouble Codes

HINT:

Codes other than DTC B1660 may be output at this time, but they are not related to this check.

DTC B1660 is not output

USE SIMULATION METHOD TO CHECK

DTC B1660 is output

REPLACE AIRBAG ECU ASSEMBLY

6.	CHECK INSTRUMENT PANEL WIRE

(a) Turn the ignition switch off.

*1	Telltale Light Assembly
*2	Airbag ECU Assembly
*3	Instrument Panel Wire
*4	Service Wire
*a	Front view of wire harness connector (to Telltale Light Assembly)
*b	Front view of wire harness connector (to Airbag ECU Assembly)

(b) Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 90 seconds.

(d) Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.

(e) Turn the ignition switch to ON.

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
G31-5 (P-AB) - Body ground	Ignition switch ON	Below 1 V
G31-4 (PAON) - Body ground	Ignition switch ON	Below 1 V

(g) Turn the ignition switch off.

(h) Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 90 seconds.

(i) Using a service wire, connect terminals 34 (P-AB) and 35 (PAON) of connector B.

NOTICE:

Do not forcibly insert the service wire into the terminals of the connector when connecting a service wire.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
G31-5 (P-AB) - G31-4 (PAON)	Always	Below 1 Ω

(k) Disconnect the service wire from connector B.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
G31-5 (P-AB) - G31-4 (PAON)	Always	1 MΩ or higher
G31-5 (P-AB) - Body ground	Always	1 MΩ or higher
G31-4 (PAON) - Body ground	Always	1 MΩ or higher

REPLACE TELLTALE LIGHT ASSEMBLY

REPLACE INSTRUMENT PANEL WIRE

7.	CHECK CONNECTION OF CONNECTORS

(a) Turn the ignition switch off.

(b) Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 90 seconds.

The connectors are not properly connected

CONNECT CONNECTORS PROPERLY

The connectors are properly connected

8.	CHECK CONNECTORS

(a) Disconnect the connectors from the airbag ECU assembly and telltale light assembly.

*1	Telltale Light Assembly
*2	Airbag ECU Assembly
*3	Instrument Panel Wire

(b) Check that the connectors (on the airbag ECU assembly side and telltale light assembly side) are not damaged.

The connectors are deformed or damaged

REPLACE INSTRUMENT PANEL WIRE

The connectors are not deformed or damaged

9.	CHECK INSTRUMENT PANEL WIRE

(a) Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.

*1	Telltale Light Assembly
*2	Airbag ECU Assembly
*3	Instrument Panel Wire
*4	Service Wire
*a	Front view of wire harness connector (to Telltale Light Assembly)
*b	Front view of wire harness connector (to Airbag ECU Assembly)

(b) Turn the ignition switch to ON.

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
G31-5 (P-AB) - Body ground	Ignition switch ON	Below 1 V
G31-4 (PAON) - Body ground	Ignition switch ON	Below 1 V

(d) Turn the ignition switch off.

(e) Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 90 seconds.

(f) Using a service wire, connect terminals 34 (P-AB) and 35 (PAON) of connector B.

NOTICE:

Do not forcibly insert the service wire into the terminals of the connector when connecting a service wire.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
G31-5 (P-AB) - G31-4 (PAON)	Always	Below 1 Ω

(h) Disconnect the service wire from connector B.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
G31-5 (P-AB) - G31-4 (PAON)	Always	1 MΩ or higher
G31-5 (P-AB) - Body ground	Always	1 MΩ or higher
G31-4 (PAON) - Body ground	Always	1 MΩ or higher

REPLACE INSTRUMENT PANEL WIRE

10.	CHECK HARNESS AND CONNECTOR (SOURCE VOLTAGE)

(a) Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.

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

(b) Turn the ignition switch to ON.

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
G31-9 (IG) - Body ground	Ignition switch ON	11 to 14 V

REPAIR OR REPLACE HARNESS OR CONNECTOR

11.	CHECK PASSENGER AIRBAG ON/OFF INDICATOR

(a) Turn the ignition switch off.

*a	Front view of wire harness connector (to Airbag ECU Assembly)

(b) Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 90 seconds.

(d) Using a service wire, connect terminal 35 (PAON) and body ground.

(e) Using a service wire, connect terminal 34 (P-AB) and body ground.

(f) Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.

(g) Turn the ignition switch to ON.

(h) Check the indicator according to the table below.

OK:

Tester Connection	Switch Condition	Passenger Airbag ON/OFF Indicator
G70-35 (PAON) - Body ground	Ignition switch ON	"ON" comes on
G70-34 (P-AB) - Body ground	Ignition switch ON	"OFF" comes on

(i) Turn the ignition switch off.

(j) Disconnect the service wire from airbag ECU assembly.

REPLACE TELLTALE LIGHT ASSEMBLY

12.

CHECK DTC

(a) Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 90 seconds.

*1	Telltale Light Assembly
*2	Airbag ECU Assembly

(b) Connect the connectors to the airbag ECU assembly.

(d) Turn the ignition switch to ON, and wait for at least 60 seconds.

(e) Clear the DTCs stored in memory.

Click here

Body Electrical > SRS Airbag > Clear DTCs

(f) Turn the ignition switch off.

(g) Turn the ignition switch to ON, and wait for at least 60 seconds.

(h) Check for DTCs.

Click here

Body Electrical > SRS Airbag > Trouble Codes

HINT:

Codes other than DTC B1660 may be output at this time, but they are not related to this check.

DTC B1660 is not output

USE SIMULATION METHOD TO CHECK

DTC B1660 is output

REPLACE AIRBAG ECU ASSEMBLY