Last Modified: 7-3-2017 6.8:8.0.40 Doc ID: RM0000017QQ005X
Model Year Start: 2007 Model: LX470 Prod Date Range: [08/2006 -           ]
Title: SUPPLEMENTAL RESTRAINT SYSTEM: AIRBAG SYSTEM: B1188/56; Short to B+ in Front Passenger Side Squib 2nd Step Circuit; 2007 MY LX470 [08/2006 -        ]

DTC

B1188/56

Short to B+ in Front Passenger Side Squib 2nd Step Circuit

DESCRIPTION

The front passenger side squib (2nd step) circuit consists of the center airbag sensor and the front passenger airbag.

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

DTC B1188/56 is recorded when a B+ short is detected in the front passenger side squib (2nd step) circuit.

DTC No.

DTC Detection Condition

Trouble Area

B1188/56
  • Short in front passenger side squib (2nd step) circuit (to B+)
  • Front passenger side squib (2nd step) malfunction
  • Center airbag sensor assembly malfunction
  • Front passenger airbag assembly (front passenger side squib (2nd step))
  • Center airbag sensor assembly
  • Dash wire

WIRING DIAGRAM

Refer to DTC B1185/57 2007 MY LX470 [08/2006 -        ]; SUPPLEMENTAL RESTRAINT SYSTEM: AIRBAG SYSTEM: B1185/57; Short in Front Passenger Side Squib 2nd Step Circuit+ .

INSPECTION PROCEDURE

PROCEDURE

1.

CHECK DASH WIRE (FRONT PASSENGER SIDE SQUIB (2ND STEP) 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 center airbag sensor and the front passenger airbag.

(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 P2+ of the A28 dash wire connector on the front passenger airbag (front passenger side squib (2nd step)) side.

Standard voltage:

Below 1 V
NG

REPAIR OR REPLACE DASH WIRE

OK

2.

CHECK CENTER AIRBAG SENSOR ASSEMBLY

(a) Connect the connector to the center airbag sensor.

(b) Using a service wire, connect P2+ and P2- of the A28 dash wire connector on the front passenger airbag (front passenger side squib (2nd step)) side.

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

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

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

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

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

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

OK:

DTC B1188/56 is not output.

HINT:

Codes other than code B1188/56 may be output at this time, but they are not relevant to this check.
NG

REPLACE CENTER AIRBAG SENSOR ASSEMBLY

OK

3.

CHECK FRONT PASSENGER SIDE SQUIB (2ND STEP)

(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 front passenger airbag (front passenger side squib (2nd step)) to the dash wire.

(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 B1188/56 is not output.

HINT:

Codes other than code B1188/56 may be output at this time, but they are not relevant to this check.
NG

REPLACE FRONT PASSENGER AIRBAG ASSEMBLY (FRONT PASSENGER SIDE SQUIB (2ND STEP))

OK

USE SIMULATION METHOD TO CHECK