Turn Signals: Description and Operation

DIRECTION INDICATOR / HAZARD WARNING LAMPS

DESCRIPTION

General
Operation of the direction indicator lamps is controlled by the column mounted switch via the Light Check Module (LCM). The direction indicator lamps operate when the ignition switch is in either the 'auxiliary' or 'ignition' positions.

The front direction indicator lamps are located within the side lamp assemblies, outboard of the headlamps. The rear direction indicator lamps are located within the tail lamp assemblies. The rear direction indicators are mounted behind the brake lamp LED assemblies. When the direction indicators are selected, a lens within the tail lamp directs the light around the outer diameter of the brake lamp LED assembly.


OPERATION

Power Distribution
Feed from the positive battery terminal (C0192) is supplied to fusible link 3, fusible link 4, and fuse 53 of the passenger compartment fuse box (C0632) on an R wire. Fusible link 3 (C0589) and fusible link 4 (C0590) provide constant battery feeds to the Light Check Module (LCM) (C0937 & C2039 respectively) on a pair of R wires.

Fuse 53 of the passenger compartment fuse box (C0583) provides a constant battery feed to the ignition switch (C0028 on V8 vehicles) on an R wire. When the ignition switch is turned to the 'auxiliary' position, current flows across the switch (C0028 on V8 vehicles) to fuse 9 of the passenger compartment fuse box (C0585) on a PB wire. Fuse 9 (C0587) provides an auxiliary ignition feed to the Light Check Module (LCM) (C2040) on a PY wire.

When the ignition switch is turned to the 'ignition' position, current flows across the switch (C0028 on V8 vehicles) to fuse 4 of the passenger compartment fuse box (C0585) on a G wire. Fuse 4 (C0587) provides an ignition feed to the LCM (C2040) on a GS wire.

The LCM (C2039) is earthed on an N wire.

RH Turn
The LCM (C2040) monitors the condition of the column mounted direction indicator switch (C1832) by providing a feed on an NB wire. If a RH turn is selected, the LCM provides the following outputs:
- From the LCM (C0937) to the RH front direction indicator lamp (C0002) on a UN wire.
- From the LCM (C2039) to the RH rear direction indicator lamp (C0125) on a UN wire.
- From the LCM (C0937) to the RH rear side repeater lamp (C0012) on a UY wire.

All are earthed on N wires.

LH Turn
The LCM (C2040) monitors the condition of the column mounted direction indicator switch (C1832) by providing a feed on an NB wire. If a LH turn is selected, the LCM provides the following outputs:
- From the LCM (C2039) to the LH front direction indicator lamp (C0001) on a UG wire.
- From the LCM (C0937) to the LH rear direction indicator lamp (C0121) on a UG wire.
- From the LCM (C2039) to the LH rear side repeater lamp (C0013) on a UY wire.

All are earthed on N wires.