Dtc B1662/45 Indicator Light Circuit Malfunction

Land Cruiser URJ200 URJ202 GRJ200 VDJ200 - SUPPLEMENTAL RESTRAINT SYSTEMS

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK CAN COMMUNICATION SYSTEM

CHECK BATTERY

CHECK CONNECTORS

CHECK HARNESS AND CONNECTOR (SOURCE VOLTAGE OF CENTER AIRBAG SENSOR)

CHECK HARNESS AND CONNECTOR (SOURCE VOLTAGE OF COMBINATION METER)

CHECK SRS WARNING LIGHT (SHORT TO GROUND)

DTC B1662/45 Indicator Light Circuit Malfunction

DESCRIPTION

The indicator light circuit consists of the center airbag sensor and the combination meter.


When the center airbag sensor detects a malfunction in the SRS airbag system, the SRS warning light comes on to inform the driver. It also comes on when the source voltage drops, and automatically goes off in approximately 10 seconds after the source voltage returns to normal (DTC is not stored).


The SRS warning light comes on for 6 seconds after the ignition switch is turned to ON and goes off if the system is normal.


When an open circuit is detected, such as when the connector between the combination meter and the center airbag sensor is disconnected, the SRS warning light remains on even when approximately 6 seconds elapsed after the ignition switch is turned to ON.


DTC B1662/45 is stored when a malfunction is detected in the indicator light circuit.

DTC CodeDTC Detection ConditionTrouble Area
B1662/45When one of the following conditions is met:
The center airbag sensor receives an open circuit signal, a short to ground signal or a short circuit to ground signal or a short circuit to B+ signal in the indicator light circuit for 2 seconds.
A combination meter malfunction.
A center airbag sensor malfunction.
Combination meter assembly (SRS warning light)
Center airbag sensor assembly
Instrument panel wire

WIRING DIAGRAM

Dtc B1662/45 Indicator Light Circuit Malfunction. 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 ().
1.CHECK CAN COMMUNICATION SYSTEM

Check if a CAN communication DTC is output.

Result
ResultProceed to
DTC is not outputA
DTC is output (for LHD)B
DTC is output (for RHD)C
B
REPAIR CIRCUITS INDICATED BY OUTPUT DTCS ()
C
REPAIR CIRCUITS INDICATED BY OUTPUT DTCS ()
A
2.CHECK BATTERY

Measure the voltage of the battery.

  • Standard Voltage:
  • 11 to 14 V
NG
CHECK AND REPLACE BATTERY OR CHARGING SYSTEM
OK
3.CHECK CONNECTORS

Turn the ignition switch off.

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

Check that the connectors are properly connected to the center airbag sensor and combination meter.

  • OK:
  • The connectors are properly connected.
NG
CONNECT CONNECTORS PROPERLY
OK
4.CHECK HARNESS AND CONNECTOR (SOURCE VOLTAGE OF CENTER AIRBAG SENSOR)
Dtc B1662/45 Indicator Light Circuit Malfunction. SUPPLEMENTAL RESTRAINT SYSTEMS. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

Disconnect the connectors from 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.

Operate all the components of the electrical system (defogger, wipers, headlights, heater blower, etc.).

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

  • Standard Voltage:
  • Tester ConnectionSwitch ConditionSpecified Condition
    E47-21 (IG2) - E47-25 (E1)Ignition switch ON11 to 14 V
    E47-21 (IG2) - E47-26 (E2)Ignition switch ON11 to 14 V
NG
REPLACE HARNESS AND CONNECTOR
OK
5.CHECK HARNESS AND CONNECTOR (SOURCE VOLTAGE OF COMBINATION METER)
Dtc B1662/45 Indicator Light Circuit Malfunction. SUPPLEMENTAL RESTRAINT SYSTEMS. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

Turn the ignition switch off.

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

Disconnect the E7 connector from the combination meter.

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
    E7-18 (IG+) - E7-15 (ET)Ignition switch ON11 to 14 V
NG
REPLACE HARNESS AND CONNECTOR
OK
6.CHECK SRS WARNING LIGHT (SHORT TO GROUND)

Turn the ignition switch off.

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

Connect the connector to the combination meter.

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

Turn the ignition switch to ON.

Check the SRS warning light condition.

  • OK:
  • After the primary check period, SRS warning light goes off for approximately 10 seconds and then remains on.
  • HINT:
  • The primary check period is approximately 6 seconds after the ignition switch is turned ON.
NG
GO TO METER / GAUGE SYSTEM ()
OK
REPLACE CENTER AIRBAG SENSOR ASSEMBLY ()