SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: B1810/53-B1813/53; Short in Driver Side Squib 2nd Step Circuit; 2016 - 2020 MY Sienna [12/2015

Last Modified: 04-05-2023	6.11:8.1.0	Doc ID: RM100000000VJQN
Model Year Start: 2016	Model: Sienna	Prod Date Range: [12/2015 - ]
Title: SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: B1810/53-B1813/53; Short in Driver Side Squib 2nd Step Circuit; 2016 - 2020 MY Sienna [12/2015 - ]

DTC

B1810/53

Short in Driver Side Squib 2nd Step Circuit

DTC

B1811/53

Open in Driver Side Squib 2nd Step Circuit

DTC

B1812/53

Short to GND in Driver Side Squib 2nd Step Circuit

DTC

B1813/53

Short to B+ in Driver Side Squib 2nd Step Circuit

DESCRIPTION

The driver side squib 2nd step circuit consists of the center airbag sensor assembly, the spiral cable and the steering pad.
The circuit signals the SRS to deploy when deployment conditions are met.
These DTCs are recorded when a malfunction is detected in the driver side squib 2nd step circuit.

DTC No.	DTC Detection Condition	Trouble Area
B1810/53	When one of following conditions is met: Center airbag sensor assembly detects line short circuit signal in driver side squib 2nd step circuit 5 times during primary check. Driver side squib 2nd step malfunction Spiral cable malfunction Center airbag sensor assembly malfunction	Instrument panel wire Spiral cable Steering pad (Driver side squib 2nd step) Center airbag sensor assembly
B1811/53	When one of following conditions is met: Center airbag sensor assembly detects open circuit signal in driver side squib 2nd step circuit for 2 seconds. Driver side squib 2nd step malfunction Spiral cable malfunction Center airbag sensor assembly malfunction	Instrument panel wire Spiral cable Steering pad (Driver side squib 2nd step) Center airbag sensor assembly
B1812/53	When one of following conditions is met: Center airbag sensor assembly detects short circuit to ground signal in driver side squib 2nd step circuit for 0.5 seconds. Driver side squib 2nd step malfunction Spiral cable malfunction Center airbag sensor assembly malfunction	Instrument panel wire Spiral cable Steering pad (Driver side squib 2nd step) Center airbag sensor assembly
B1813/53	When one of following conditions is met: Center airbag sensor assembly detects short circuit to B+ signal in driver side squib 2nd step circuit for 0.5 seconds. Driver side squib 2nd step malfunction Spiral cable malfunction Center airbag sensor assembly malfunction	Instrument panel wire Spiral cable Steering pad (Driver side squib 2nd step) Center airbag sensor assembly

WIRING DIAGRAM

CAUTION / NOTICE / HINT

HINT:

Perform the simulation method by selecting Check Mode (signal check) with the Techstream (See page ).
After selecting Check Mode (signal check), perform the simulation method by wiggling each connector of the airbag system or driving the vehicle on a city street or rough road (See page ).

PROCEDURE

1.	CHECK CONNECTOR

(a) Turn the ignition switch off.

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

OK:

The connector is properly connected.

HINT:

If the connector is not connected securely, reconnect the connector and proceed to the next inspection.

(d) Disconnect the connector from the steering pad.

(e) Check that the spiral cable connector (on the steering pad side) is not damaged.

OK:

The lock button is not disengaged, or the claw of the lock is not deformed or damaged.

REPLACE SPIRAL CABLE

2.	INSPECT STEERING PAD (DRIVER SIDE SQUIB 2ND STEP)

SST: 09843-18061

(a) Disconnect the connector from the steering pad.

Text in Illustration

*1	Driver Side Squib 2nd Step	*2	Spiral Cable
*3	Center Airbag Sensor Assembly	*4	Connector E
*5	Color: Black	*6	DTC 53
*a	Front view of wire harness connector (to Driver Side Squib 2nd Step)	*b	Front view of DLC3

(b) Connect SST (resistance 2.1 Ω) to connector E (black connector).

CAUTION:

Never connect a tester to the steering pad (driver side squib 2nd step) for measurement, as this may lead to a serious injury due to airbag deployment.

NOTICE:

Do not forcibly insert SST into the terminals of the connector when connecting.
Insert SST straight into the terminals of the connector.

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

(e) Clear the DTCs stored in the memory (See page ).

(f) Turn the ignition switch off.

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

(h) Turn the steering wheel lock to lock 5 times or more.

(i) Check the DTCs (See page ).

OK:

DTC B1810/53, B1811/53, B1812/53 or B1813/53 is not output.

HINT:

DTCs other than B1810/53, B1811/53, B1812/53 and B1813/53 may be output at this time, but they are not related to this check.

REPLACE STEERING PAD

3.	CHECK CONNECTOR

(a) Turn the ignition switch off.

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

(d) Check that the connectors that link the spiral cable and instrument panel wire harness are properly connected.

OK:

The connectors are properly connected.

HINT:

If the connectors are not connected securely, reconnect the connectors and proceed to the next inspection.

(e) Disconnect the connectors that link the spiral cable and instrument panel wire.

(f) Check that the terminals of the connectors are not damaged.

OK:

The terminals are not deformed or damaged.

(g) Check that the short spring for the spiral cable connector with the activation prevention mechanism is not deformed or damaged.

OK:

The short spring is not deformed or damaged.

REPLACE SPIRAL CABLE OR INSTRUMENT PANEL WIRE

4.	CHECK SPIRAL CABLE (DRIVER SIDE SQUIB 2ND STEP - INSTRUMENT PANEL WIRE)

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

(b) Turn the ignition switch to ON.

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
z5-1 (D2-) - Body ground	Ignition switch ON	Below 1 V
z5-2 (D2+) - Body ground	Ignition switch ON	Below 1 V

Text in Illustration

*1	Driver Side Squib 2nd Step
*2	Spiral Cable
*3	Instrument Panel Wire
*4	Center Airbag Sensor Assembly
*5	Connector E
*6	Color: Black
*a	Front view of wire harness connector (to Driver Side Squib 2nd Step)

(d) Turn the ignition switch off.

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

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
z5-1 (D2-) - z5-2 (D2+)	Always	Below 1 Ω

(g) Release the activation prevention mechanism built into connector D (See page ).

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
z5-1 (D2-) - z5-2 (D2+)	Always	1 MΩ or higher
z5-1 (D2-) - Body ground	Always	1 MΩ or higher
z5-2 (D2+) - Body ground	Always	1 MΩ or higher

(i) Restore the released activation prevention mechanism of connector D to the original condition.

REPLACE SPIRAL CABLE

5.	CHECK CONNECTOR

(a) Check that the connector is properly connected to the center airbag sensor assembly.

OK:

The connector is properly connected.

HINT:

If the connector is not connected securely, reconnect the connector and proceed to the next inspection.

(b) Disconnect the connector from the center airbag sensor assembly.

OK:

The terminal is not deformed or damaged.

(d) Check that the short spring for the instrument panel wire connector with the activation prevention mechanism is not deformed or damaged.

OK:

The short spring is not deformed or damaged.

REPLACE INSTRUMENT PANEL WIRE

6.	CHECK INSTRUMENT PANEL WIRE (SPIRAL CABLE - CENTER AIRBAG SENSOR ASSEMBLY)

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

(b) Turn the ignition switch to ON.

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

D20-3 (D2-) -

Body ground

Ignition switch ON

Below 1 V

D20-4 (D2+) -

Body ground

Ignition switch ON

Below 1 V

Text in Illustration

*1	Driver Side Squib 2nd Step
*2	Spiral Cable
*3	Instrument Panel Wire
*4	Center Airbag Sensor Assembly
*5	Connector C
*a	Rear view of wire harness connector (to Spiral Cable)

(d) Turn the ignition switch off.

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

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D20-3 (D2-) - D20-4 (D2+)	Always	Below 1 Ω

(g) Release the activation prevention mechanism built into connector B (See page ).

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D20-3 (D2-) - D20-4 (D2+)

Always

1 MΩ or higher

D20-3 (D2-) -

Body ground

Always

1 MΩ or higher

D20-4 (D2+) -

Body ground

Always

1 MΩ or higher

(i) Restore the released activation prevention mechanism of connector B to the original condition.

REPLACE INSTRUMENT PANEL WIRE

7.	CHECK CENTER AIRBAG SENSOR ASSEMBLY

(a) Connect the connectors to the steering pad, spiral cable and the center airbag sensor assembly.

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

(d) Clear the DTCs stored in the memory (See page ).

(e) Turn the ignition switch off.

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

(g) Check the DTCs (See page ).

OK:

DTC B1810/53, B1811/53, B1812/53 or B1813/53 is not output.

Text in Illustration

*1	Driver Side Squib 2nd Step
*2	Spiral Cable
*3	Center Airbag Sensor Assembly
*4	DTC 53
*a	Front view of DLC3

HINT:

DTCs other than B1810/53, B1811/53, B1812/53 and B1813/53 may be output at this time, but they are not related to this check.

USE SIMULATION METHOD TO CHECK

REPLACE CENTER AIRBAG SENSOR ASSEMBLY