Turn Signals: Description and Operation

System Description

TURN SIGNAL OPERATION

When the ignition switch is in the ON or START position, power is supplied
- through 10 A fuse [No. 1, located in the fuse block (J/B)]
- to BCM (body control module) terminal 38, and
- through 10 A fuse [No. 14, located in the fuse block (J/B)]
- to combination meter terminal 22.

Ground is supplied
- to BCM terminal 67 and
- to combination meter terminals 23, 25 and 28
- through grounds F14, M57 and M61.

LH Turn
When the turn signal switch (combination switch) is moved to the L position, the BCM receives input requesting the left turn signals to flash. The BCM then supplies power
- to front turn signal lamp LH terminal 3
- to rear turn signal lamp LH (part of the rear combination lamp LH) terminal 3.

Ground is supplied
- to front turn signal lamp LH terminal 2
- through grounds E15 and E24, and
- to rear turn signal lamp LH terminal 5
- through grounds B7 and B19.

The BCM sends a signal to combination meter across the CAN communication lines. This input is processed by the CPU (central processing unit) of the combination meter, which in turn supplies ground to the left turn signal indicator lamp.

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

RH Turn
When the turn signal switch (combination switch) is moved to the R position, the BCM receives input requesting the right turn signals to flash. The BCM then supplies power
- to front turn signal lamp RH terminal 3
- to rear turn signal lamp RH (part of the rear combination lamp RH) terminal 3.

Ground is supplied
- to front turn signal lamp RH terminal 2
- through grounds E15 and E24, and
- to rear turn signal lamp RH terminal 5
- through grounds B7 and B19.

The BCM sends a signal to combination meter across the CAN communication lines. This input is processed by the CPU of the combination meter, which in turn supplies ground to the right turn signal indicator lamp.

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

REMOTE KEYLESS ENTRY SYSTEM OPERATION

Power is supplied at all times
- through 50 A fusible link (letter f , located in the fuse and fusible link box)
- to BCM terminal 70, and
- through 10 A fuse [No. 19, located in the fuse block (J/B)]
- to combination meter terminal 21.

Ground is supplied
- to BCM terminal 67 and
- to combination meter terminals 23, 25 and 28
- through grounds F14, M57 and M61.

When the remote keyless entry system is triggered by input from the keyfob, the BCM supplies power
- to front turn signal lamp LH terminal 3
- to front turn signal lamp RH terminal 3
- to rear turn signal lamp LH terminal 3
- to rear turn signal lamp RH terminal 3.

Ground is supplied
- to front turn signal lamp LH terminal 2
- to front turn signal lamp RH terminal 2
- through grounds E15 and E24, and
- to rear turn signal lamp LH terminal 5
- to rear turn signal lamp RH terminal 5
- through grounds B7 and B19.

The BCM sends a signal to combination meter across the CAN communication lines. This input is processed by the CPU of the combination meter, which in turn supplies ground to the left and right turn signal indicator lamps.

With power and ground supplied, the BCM controls the flashing of the hazard warning lamps when keyfob is used to activate the remote keyless entry system.

CAN Communication System Description
Refer to "INFORMATION BUS".