Last Modified: 7-3-2017 6.8:8.0.40 Doc ID: RM0000017PO005X
Model Year Start: 2007 Model: LX470 Prod Date Range: [08/2006 -           ]
Title: SUPPLEMENTAL RESTRAINT SYSTEM: AIRBAG SYSTEM: B0103/12; Short to B+ in Driver Side Squib Circuit; 2007 MY LX470 [08/2006 -        ]

DTC

B0103/12

Short to B+ in Driver Side Squib Circuit

DESCRIPTION

The driver side squib circuit consists of the center airbag sensor, the spiral cable and the steering wheel pad.

The circuit instructs the SRS to deploy when deployment conditions are met.

DTC B0103/12 is recorded when a B+ short is detected in the driver side squib circuit.

DTC No.

DTC Detection Condition

Trouble Area

B0103/12
  • Short circuit in driver side squib circuit (to B+)
  • driver side squib malfunction
  • Spiral cable malfunction
  • Center airbag sensor assembly malfunction
  • Steering wheel pad (driver side squib)
  • Spiral cable
  • Center airbag sensor assembly
  • Dash wire
  • Column wire

WIRING DIAGRAM

Refer to DTC B0100/13 2007 MY LX470 [08/2006 -        ]; SUPPLEMENTAL RESTRAINT SYSTEM: AIRBAG SYSTEM: B0100/13; Short in Driver Side Squib Circuit+ .

INSPECTION PROCEDURE

PROCEDURE

1.

CHECK DRIVER SIDE SQUIB CIRCUIT

(a) Turn the ignition switch to LOCK.

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

(c) Disconnect the connectors from the C32 center airbag sensor and the steering wheel pad.

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

(e) Turn the ignition switch to ON.

(f) Measure the voltage between the body ground and D+ of the orange connector on the steering wheel pad (driver side squib) side between the center airbag sensor and the steering wheel pad (driver side squib).

Standard voltage:

Below 1 V

NG

GO TO STEP 4

OK

2.

CHECK CENTER AIRBAG SENSOR ASSEMBLY

(a) Turn the ignition switch to LOCK.

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

(c) Connect the C32 connector to the center airbag sensor.

(d) Using a service wire, connect D+ and D- of the orange connector on the steering wheel pad (driver side squib) side between the center airbag sensor and the steering wheel pad (driver side squib).

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

(f) Turn the ignition switch to ON, and wait at least for 10 seconds.

(g) Clear the DTC stored in memory 2007 MY LX470 [08/2006 -        ]; SUPPLEMENTAL RESTRAINT SYSTEM: AIRBAG SYSTEM: DTC CHECK / CLEAR .

(h) Turn the ignition switch to LOCK, and wait at least for 10 seconds.

(i) Turn the ignition switch to ON, and wait at least for 10 seconds.

(j) Check the DTC 2007 MY LX470 [08/2006 -        ]; SUPPLEMENTAL RESTRAINT SYSTEM: AIRBAG SYSTEM: DTC CHECK / CLEAR .

OK:

DTC B0103/12 is not output.

HINT:

Codes other than code B0103/12 may be output at this time, but they are not relevant to this check.

NG

REPLACE CENTER AIRBAG SENSOR ASSEMBLY

OK

3.

CHECK DRIVER SIDE SQUIB

(a) Turn the ignition switch to LOCK.

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

(c) Connect the steering wheel pad (driver side squib) to the spiral cable.

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

(e) Turn the ignition switch to ON, and wait at least for 10 seconds.

(f) Clear the DTC stored in memory 2007 MY LX470 [08/2006 -        ]; SUPPLEMENTAL RESTRAINT SYSTEM: AIRBAG SYSTEM: DTC CHECK / CLEAR .

(g) Turn the ignition switch to LOCK, and wait at least for 10 seconds.

(h) Turn the ignition switch to ON, and wait at least for 10 seconds.

(i) Check the DTC 2007 MY LX470 [08/2006 -        ]; SUPPLEMENTAL RESTRAINT SYSTEM: AIRBAG SYSTEM: DTC CHECK / CLEAR .

OK:

DTC B0103/12 is not output.

HINT:

Codes other than code B0103/12 may be output at this time, but they are not relevant to this check.

NG

REPLACE STEERING WHEEL PAD (DRIVER SIDE SQUIB)

OK

REPLACE USE SIMULATION METHOD TO CHECK

4.

CHECK SPIRAL CABLE

(a) Turn the ignition switch to LOCK.

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

(c) Disconnect the A29 spiral cable connector from the column wire.

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

(e) Turn the ignition switch to ON.

(f) Measure the voltage between the body ground and D+ of the orange spiral cable connector on the steering wheel pad (driver side squib) side.

Standard voltage:

Below 1 V

NG

REPLACE SPIRAL CABLE

OK

5.

CHECK COLUMN WIRE

(a) Turn the ignition switch to LOCK.

(b) Disconnect the II4 column wire connector from the dash wire.

(c) Turn the ignition switch to ON.

(d) Measure the voltage between the body ground and D+ of the A29 column wire connector on the spiral cable side.

Standard voltage:

Below 1 V

NG

REPAIR OR REPLACE COLUMN WIRE

OK

6.

CHECK DASH WIRE

(a) Turn the ignition switch to ON.

(b) Measure the voltage between the body ground and D+ of the II4 dash wire connector on the column wire side.

Standard voltage:

Below 1 V

NG

REPAIR OR REPLACE DASH WIRE

OK

USE SIMULATION METHOD TO CHECK