GSIC - Global Service Information Center

### ENGINE IMMOBILISER SYSTEM > Power Source Circuit

## DESCRIPTION

This circuit provides power to operate the transponder key ECU.

## WIRING DIAGRAM

## INSPECTION PROCEDURE

1.INSPECT FUSE (ECU-B, DCC, IGN)

1. Remove the ECU-B and DCC fuses from the engine room relay block.

1. Remove the IGN fuse from the instrument panel junction block.

1. Measure the resistance of the fuses.

   Standard resistance:
     Below 1 Ω

| NG |

REPLACE FUSE

OK |

2.INSPECT IGNITION SWITCH

1. Remove the ignition switch.

1. Measure the resistance of the switch.

   Standard resistance:

     Tester Connection | Switch Condition | Specified Condition
     5 (AM2) - 6 (IG2) | LOCK, ACC | 10 kΩor higher
     ON, START | Below 1 Ω

| NG |

REPLACE IGNITION SWITCH

OK |

3.CHECK WIRE HARNESS (TRANSPONDER KEY ECU ASSEMBLY - BATTERY AND BODY GROUND)

1. Disconnect the T21 ECU connector.

1. Measure the resistance and voltage of the wire harness side connector.

   Standard resistance:

     Tester Connection | Condition | Specified Condition
     T21-16 (GND) - Body ground | Always | Below 1 Ω

   Standard voltage:

     Tester Connection | Condition | Specified Condition
     T21-1 (+B) - Body ground | Always | 10 to 14 V
     T21-2 (IG) - Body ground | Ignition switch OFF | Below 1 V
     Ignition switch ON | 10 to 14 V

| NG |

REPAIR OR REPLACE HARNESS AND CONNECTOR

OK |

REPLACE TRANSPONDER KEY ECU ASSEMBLY