Dtc B1800/51 Short In Driver Side Squib Circuit

Land Cruiser URJ200 URJ202 GRJ200 VDJ200 - SUPPLEMENTAL RESTRAINT SYSTEMS

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK STEERING PAD (DRIVER SIDE SQUIB)

CHECK CONNECTOR

CHECK DRIVER SIDE SQUIB CIRCUIT

CHECK CENTER AIRBAG SENSOR

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

DTC B1800/51 Short in Driver Side Squib Circuit

DTC B1801/51 Open in Driver Side Squib Circuit

DTC B1802/51 Short to GND in Driver Side Squib Circuit

DTC B1803/51 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 pad.
The circuit instructs the SRS to deploy when deployment conditions are met.
These DTCs are stored when a malfunction is detected in the driver side squib circuit.
DTC CodeDTC Detection ConditionTrouble Area
B1800/51 When one of the following conditions is met:
The center airbag sensor receives a line short circuit signal 5 times in the driver side squib circuit during the primary check.
A driver side squib malfunction.
A spiral cable malfunction.
A center airbag sensor malfunction.
Instrument panel wire
Spiral cable
Steering pad (Driver side squib)
Center airbag sensor assembly
B1801/51 When one of the following conditions is met:
The A center airbag sensor receives an open circuit signal in the driver side squib circuit for 2 seconds.
A driver side squib malfunction.
A spiral cable malfunction.
A center airbag sensor malfunction.
Instrument panel wire
Spiral cable
Steering pad (Driver side squib)
Center airbag sensor assembly
B1802/51 When one of the following conditions is met:
The center airbag sensor receives a short circuit to ground signal in the driver side squib circuit for 0.5 seconds.
A driver side squib malfunction.
A spiral cable malfunction.
A center airbag sensor malfunction.
Instrument panel wire
Spiral cable
Steering pad (Driver side squib)
Center airbag sensor assembly
B1803/51 When one of the following conditions is met:
The center airbag sensor receives a short circuit to B+ signal in the driver side squib circuit for 0.5 seconds.
A driver side squib malfunction.
A spiral cable malfunction.
A center airbag sensor malfunction.
Instrument panel wire
Spiral cable
Steering pad (Driver side squib)
Center airbag sensor assembly

WIRING DIAGRAM

Dtc B1800/51 Short In Driver Side Squib Circuit. SUPPLEMENTAL RESTRAINT SYSTEMS. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

INSPECTION PROCEDURE

  • NOTICE:
After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work ().
When disconnecting the cable, some systems need to be initialized after the cable is reconnected ().
  • HINT:
  • To perform the simulation method, enter the check mode (signal check) with the intelligent tester (), and then wiggle each connector of the airbag system or drive the vehicle on various type of road ().
1.CHECK STEERING PAD (DRIVER SIDE SQUIB)

Turn the ignition switch off.

Dtc B1800/51 Short In Driver Side Squib Circuit. SUPPLEMENTAL RESTRAINT SYSTEMS. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

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

Disconnect the connectors from the steering pad.

Connect the white wire side of SST (resistance: 2.1 Ω) to connector E (orange connector).

  • CAUTION:
  • Never connect the tester to the steering pad (driver side squib) 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 SST.
Insert SST straight into the terminals of the connector.
  • SST
  • 09843-18061

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

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

Clear the DTCs ().

Turn the ignition switch off.

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

Check for DTCs ().

  • OK:
  • DTC B1800, B1801, B1802 or B1803 is not output.
  • HINT:
  • Codes other than DTC B1800, B1801, B1802 and B1803 may be output at this time, but they are not related to this check.
NG
Go to step 2
OK
REPLACE STEERING PAD ()
2.CHECK CONNECTOR

Turn the ignition switch off.

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

Disconnect SST from connector E.

Check that the spiral cable connectors (on the steering pad side) are not damaged.

  • OK:
  • The lock button is not disengaged, and the claw of the lock is not deformed or damaged.
NG
REPLACE SPIRAL CABLE ()
OK
3.CHECK DRIVER SIDE SQUIB CIRCUIT

Disconnect the connectors from the center airbag sensor.

Dtc B1800/51 Short In Driver Side Squib Circuit. SUPPLEMENTAL RESTRAINT SYSTEMS. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

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

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

  • Standard Voltage:
  • Tester ConnectionSwitch ConditionSpecified Condition
    z39-1 - Body groundIgnition switch ONBelow 1 V
    z39-2 - Body groundIgnition switch ONBelow 1 V

Turn the ignition switch off.

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

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

  • Standard Resistance:
  • Tester ConnectionConditionSpecified Condition
    z39-1 - z39-2AlwaysBelow 1 Ω

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

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

  • Standard Resistance:
  • Tester ConnectionConditionSpecified Condition
    z39-1 - z39-2Always1 MΩ or higher
    z39-1 - Body groundAlways1 MΩ or higher
    z39-2 - Body groundAlways1 MΩ or higher
NG
Go to step 5
OK
4.CHECK CENTER AIRBAG SENSOR
Dtc B1800/51 Short In Driver Side Squib Circuit. SUPPLEMENTAL RESTRAINT SYSTEMS. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

Connect the connectors to the steering pad and the center airbag sensor.

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

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

Clear the DTCs ().

Turn the ignition switch off.

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

Check for DTCs ().

  • OK:
  • DTC B1800, B1801, B1802 or B1803 is not output.
  • HINT:
  • Codes other than DTC B1800, B1801, B1802 and B1803 may be output at this time, but they are not related to this check.
NG
REPLACE CENTER AIRBAG SENSOR ASSEMBLY ()
OK
USE SIMULATION METHOD TO CHECK ()
5.CHECK INSTRUMENT PANEL WIRE (CENTER AIRBAG SENSOR - SPIRAL CABLE)

Restore the released activation prevention mechanism of connector B to its original condition.

Dtc B1800/51 Short In Driver Side Squib Circuit. SUPPLEMENTAL RESTRAINT SYSTEMS. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

Disconnect the instrument panel wire connector from the spiral cable.

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

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

  • Standard Voltage:
  • Tester ConnectionSwitch ConditionSpecified Condition
    E13-1 (D+) - Body groundIgnition switch ONBelow 1 V
    E13-2 (D-) - Body groundIgnition switch ONBelow 1 V

Turn the ignition switch off.

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

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

  • Standard Resistance:
  • Tester ConnectionConditionSpecified Condition
    E13-1 (D+) - E13-2 (D-)AlwaysBelow 1 Ω

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

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

  • Standard Resistance:
  • Tester ConnectionConditionSpecified Condition
    E13-1 (D+) - E13-2 (D-)Always1 MΩ or higher
    E13-1 (D+) - Body groundAlways1 MΩ or higher
    E13-2 (D-) - Body groundAlways1 MΩ or higher
NG
REPLACE INSTRUMENT PANEL WIRE
OK
REPLACE SPIRAL CABLE ()