Turn Signals: Description and Operation

Turn Signal And Hazard Warning Lamps Schematic:

Turn Signal And Hazard Warning Lamps Schematic

TURN SIGNAL AND HAZARD WARNING LAMPS

System Description

TURN SIGNAL OPERATION

Power is supplied at all times
- through 40 A fusible link (letter g, located in the fuse and fusible link box)
- to BCM (body control module) terminal 70,
- through 10 A fuse [No. 8, located in the fuse block (J/B)]
- to BCM terminal 57,
- through 10 A fuse [No. 13, located in the fuse block (J/B)]
- to combination meter terminal 27.

With the ignition switch in the ON or START position, power is supplied
- through 10 A fuse [No. 6, located in fuse block (J/B)]
- to BCM terminal 38,
- through 10 A fuse [No. 3, located in fuse block (J/B)]
- to combination meter terminal 28.

With the ignition switch in the ACC or ON position, power is supplied
- through 10 A fuse [No. 20, located in the fuse block (J/B)]
- to BCM terminal 11.

Ground is supplied
- to BCM terminal 67 and
- to combination meter terminals 21, 22 and 23
- through grounds M57 and M61.

LH Turn Signal Lamp
When the turn signal switch is moved to the left turn position, the BCM receives an input signal requesting left turn signals to flash. The BCM then supplies power
- through BCM terminal 60
- to front combination lamp LH terminal 4 and
- to rear combination lamp LH terminal 6.

Ground is supplied
- to front combination lamp LH terminal 5
- through grounds E15 and E24,
- to rear combination lamp LH terminal 1
- through grounds B7 and B19.

The BCM also sends a request, via the CAN communication lines, to the combination meter to flash the left turn signal indicator. The unified meter control unit in the combination meter supplies ground to the left turn signal indicator lamp and activates the audible turn signal indicator. With power, ground and input supplied, the BCM controls the flashing of the turn signal lamps.

RH Turn Signal Lamp
When turn signal switch is moved to the right turn position, the BCM receives an input signal requesting right turn signals to flash. The BCM then supplies power
- through BCM terminal 61
- to front combination lamp RH terminal 4 and
- to rear combination lamp RH terminal 6.

Ground is supplied
- to front combination lamp RH terminal 5
- through grounds E15 and E24,
- to rear combination lamp RH terminal 1
- through grounds B117, B132 (all models) and D402 (with hatchback).

The BCM also sends a request, via the CAN communication lines, to the combination meter to flash the right turn signal indicator. The unified meter control unit in the combination meter supplies ground to the right turn signal indicator lamp and activates the audible turn signal indicator.

With power, ground and input supplied, the BCM controls the flashing of the turn signal lamps.

REMOTE KEYLESS ENTRY SYSTEM OPERATION
Power is supplied at all times
- through 40 A fusible link (letter g, located in fuse, fusible link and relay box)
- to BCM terminal 70,
- through 10 A fuse [No. 13, located in fuse block (J/B)]
- to combination meter terminal 27.

Ground is supplied
- to BCM terminal 67 and
- to combination meter terminals 21, 22 and 23
- through grounds M57 and M61.

When the remote keyless entry system is triggered by input from the keyfob, the BCM supplies power
- through BCM terminal 60
- to front combination lamp LH terminal 4 and
- to rear combination lamp LH terminal 6,
- through BCM terminal 61
- to front turn signal lamp RH terminal 4 and
- to rear combination lamp RH terminal 6.

Ground is supplied
- to front combination lamp LH and RH terminals 5
- through grounds E15 and E24,
- to rear combination lamp LH terminal 1
- through grounds B7 and B19,
- to rear combination lamp RH terminal 1
- through grounds B117, B132 (all models) and D402 (with hatchback).

The BCM also supplies input to combination meter via the CAN communication lines. This input is processed by the unified meter control unit in combination meter, which in turn supplies ground to the left and right turn signal indicator lamps.
With power and ground supplied, BCM controls flashing of hazard warning lamps when keyfob is used to activate remote keyless entry system.

COMBINATION SWITCH READING FUNCTION
Refer to "System Description" in Body Control Systems.

CAN Communication System Description
Refer to "Information Bus".