The BCM supplies a voltage to the left rear and right rear side repeater lamps supply voltage circuit.

The BCM detects a short to ground in the Left or Right Rear turn Signal supply voltage circuit.

The right or left rear turn signal lamps are always on or do not illuminate.

An open/high resistance or a short to ground in the turn signal switch would cause the turn signal and side repeater lamps to become inoperative.

Schematic Reference

Exterior Lights Schematics

Connector End View

Lighting Systems Connector End Views

Electrical Information Reference

Scan Tool Reference

Ignition ON, observe right or left rear turn signal and right or left side repeater lamps while engaging the turn signal switch in the appropriate position. Selecting the left or right side repeater lamps should illuminate the selected lamps.

Turn Signal Multifunction Switch Circuit Testing

1. Ignition OFF, disconnect the harness connector at the turn signal multifunction switch terminals C2 pin G and H.
2. Ignition ON, install a test lamp between the turn signal voltage supply circuit terminal and ground. The test lamp should flash ON and OFF.

⇒	If the test lamp does not flash, test the voltage supply circuit for a short to ground or an open/high resistance.

3. Install a 3-amp fused jumper wire between the voltage supply circuit and the turn signal circuit. Verify that the proper turn signal and side repeater lamps are ON.

⇒	If the turn signals are not ON, test the appropriate signal circuit of the turn signal switch for a short to voltage, short to ground or an open/high resistance.

4. If all circuits test normal, test or replace the turn signal multifunction switch.

Park/Turn Signal/Turn Signal Indicator Circuit Testing

1. Ignition OFF, remove the inoperative light bulb.
2. Test for less than 1 ohm of resistance between the ground circuit and ground.

⇒	If greater than 1 ohm, test the ground circuit for an open/high resistance.

3. Connect a test lamp between the control circuit and the ground circuit.
4. Ignition ON, turn ON the appropriate turn signal, the test lamp should flash.

⇒	If the test lamp remains ON all the time, test for a short to voltage on the control circuit. If the circuit tests normal, replace the BCM

⇒	If the test lamp remains OFF all the time, test for a short to ground or an open/high resistance on the control circuit. If the circuit tests normal, test or replace the turn signal multifunction switch.

5. If all circuits test normal, test or replace the light bulb.

BCM Circuit Testing

1. Ignition OFF, disconnect the harness connector at the BCM, left and right rear turn signal supply voltage terminals C5 pins 1 and 2 for the rear turn signals. Disconnect the harness connector of the left and right front turn signal supply voltage terminals C5 pins 5 and 4 for the front turn signals.
2. Test for less than 1 ohm of resistance between the supply voltage circuit and ground.

⇒	If greater than 1 ohm, test the supply voltage circuit for an open/high resistance.

3. Connect a test lamp between the control circuit and the ground circuit.
4. Ignition ON, turn ON the appropriate turn signal. The test lamp should flash.

⇒	If the test lamp remains ON all the time, test for a short to voltage on the control circuit. If the circuit tests normal, replace the BCM.

⇒	If the test lamp remains OFF all the time, test for a short to ground or an open/high resistance on the control circuit. If the circuit tests normal, test or replace the turn signal multifunction switch.

5. If all circuits test normal, replace the BCM.

Turn Signal Switch Testing

1. Ignition OFF, disconnect the harness connector at the turn signal multifunction switch terminals C2 pins G and H.
2. Test for infinite resistance between the signal terminals and the voltage supply terminal with the switch in the open position.

⇒	If less than infinite resistance, replace the turn signal multifunction switch.

3. Test for less than 1.5 ohms between the signal terminals and the voltage supply terminal with the switch in the closed position.

⇒	If greater than the specified range, replace the turn signal multifunction switch.

Park/Turn Signal Indicator Bulb Testing

1. Ignition OFF, remove the appropriate light bulb.
2. Test for less than 4.5 ohms between the two terminals on the light bulb.

⇒	If greater than the specified range, replace the light bulb.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.