Turn Signals: Description and Operation

System Description

TURN SIGNAL OPERATION
When the ignition switch is in the ON or START position, power is supplied
- to BCM (body control module) terminal 38
- through 10 A fuse [No. 1, located in the fuse block (J/B)]
- to combination meter terminals 41 and 42
- through 10 A fuse [No. 14, located in the fuse block (J/B)].

Ground is supplied
- to BCM (body control module) terminal 52
- through grounds M30 and M66, and
- to combination meter terminals 45 and 46
- through grounds M30 and M66.

LH Turn
When the turn signal switch (combination switch) is moved to the left position, the BCM (body control module) receives input signal requesting the left turn signals to flash. The BCM then supplies power
- through BCM (body control module) terminal 45
- to front combination lamp LH terminal 6, and
- to rear combination lamp LH terminal 5.

Ground is supplied to the front combination lamp LH terminal 4 through grounds E17 and E43.

Ground is supplied to the rear combination lamp LH terminal 4 through grounds B5 and B103.

The BCM also supplies input to combination meter terminals 27 and 28 across the CAN communication lines.

This input is processed by the unified meter control unit in the combination meter, which in turn supplies ground to the left turn signal indicator lamp.

With power and input 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 right position, the BCM (body control module) receives input signal requesting the right turn signals to flash. The BCM then supplies power
- through BCM (body control module) terminal 46
- to front combination lamp RH terminal 6, and
- to rear combination lamp RH terminal 5.

Ground is supplied to the front combination lamp RH terminal 4 through grounds E17 and E43.

Ground is supplied to the rear combination lamp RH terminal 4 through grounds B5 and B103.

The BCM also supplies input to combination meter terminals 27 and 28 across the CAN communication lines.

This input is processed by the unified meter control unit in the combination meter, which in turn supplies ground to the right turn signal indicator lamp.

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

COMBINATION SWITCH READING FUNCTION
Refer to "COMBINATION SWITCH READING FUNCTION" in Body Control Module.

REMOTE KEYLESS ENTRY SYSTEM OPERATION

Power is supplied at all times
- to BCM (body control module) terminal 55
- through 50 A fusible link [letter F, located in the fuse and fusible link box], and
- to combination meter terminal 43
- through 10 A fuse [No. 19, located in the fuse block (J/B)].

Ground is supplied
- to BCM terminal 52,
- through grounds M30 and M66, and
- to combination meter terminals 45 and 46
- through grounds M30 and M66.

When the remote keyless entry system is triggered by input from the keyfob, the BCM supplies power
- through BCM terminal 45
- to front combination lamp LH terminal 6
- to rear combination lamp LH terminal 5
- through BCM terminal 46
- to front combination lamp RH terminal 6
- to rear combination lamp RH terminal 5.

Ground is supplied
- to the front combination lamp LH terminal 4 through grounds E17 and E43
- to the front combination lamp RH terminal 4 through grounds E17 and E43
- to the rear combination lamp LH terminal 4 through grounds B5 and B103
- to the rear combination lamp RH terminal 4 through grounds B5 and B103.
The BCM also supplies input to combination meter terminals 27 and 28 across the CAN communication lines.

This input is processed by the unified meter control unit in 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 key fob is used to activate the remote keyless entry system.

CAN Communication System Description
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability. Many electronic control units are equipped onto a vehicle, and each control unit shares information and links with other control units during operation (not independent). In CAN communication, control units are connected with 2 communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring. Each control unit transmits/receives data but selectively reads required data only.

CAN Communication Unit
Refer to Information Bus.