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Turn Signal Lamps and/or Indicators Inoperative



TURN SIGNAL LAMPS AND/OR INDICATORS INOPERATIVE

DIAGNOSTIC INSTRUCTIONS
- Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
- Strategy Based Diagnosis
- Diagnostic Procedure Instructions Initial Inspection and Diagnostic Overview





DIAGNOSTIC FAULT INFORMATION

CIRCUIT/SYSTEM DESCRIPTION
Voltage runs through the hazard switch, than through the turn signal relay before reaching the turn signal switch. When the turn signal switch is engaged, the switch closes and supplies voltage to the park/turn signal lamps.

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

CIRCUIT/SYSTEM VERIFICATION
Ignition ON, observe right or left turn signal while engaging turn signal switch in the appropriate position.

CIRCUIT/SYSTEM TESTING

Turn Signal Relay Circuit Testing
1. Ignition OFF, disconnect the harness connector at the turn signal relay.
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 voltage supply circuit and the ground circuit. The test lamp should stay ON.
- If the test lamp remains OFF, test for a short to ground or an open/high resistance on the voltage supply circuit.
4. If all circuits test normal, test or replace the turn signal relay.

Turn Signal Switch Circuit Testing
1. Ignition OFF, disconnect the harness connector at the turn signal switch.
2. Ignition ON, install a test lamp between the turn signal voltage supply circuit 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 lamps are ON.
- If the turn signals are not ON, test the 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 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, test or replace the turn signal relay.
- 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 switch.
5. If all circuits test normal, test or replace the light bulb.

Instrument Panel (I/P) Circuit Testing
1. Ignition OFF, disconnect the harness connector at the I/P.
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, test or replace the turn signal relay.
- 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 switch.
5. If all circuits test normal, replace the I/P.

COMPONENT TESTING

Turn Signal Relay Testing
1. Install a 15-amp fused jumper wire between the voltage supply circuit terminal and 12 volts. Install a jumper wire between the ground terminal and ground and between the turn signal, signal circuit and ground.
2. Observe, feel, and or listen to the operation of the turn signal relay. The turn signal relay should click
- If the function does not perform as specified, replace the turn signal relay.

Turn Signal Switch Testing
1. Ignition OFF, disconnect the harness connector at the turn signal switch.
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 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 1.5 ohms, replace the turn signal switch.

Park/Turn Signal/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 4.5 ohms, replace the light bulb.

REPAIR INSTRUCTIONS
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
- Park/Turn Signal Lamp Bulb Replacement (Equinox Park Lamp) Park/Turn Signal Lamp Bulb Replacement (Equinox Turn Lamp) Park/Turn Signal Lamp Bulb Replacement (Torrent Turn Lamp)
- Rear Turn Signal Lamp Bulb Replacement (Equinox) Rear Turn Signal Lamp Bulb Replacement (Torrent)
- Turn Signal Multifunction Switch Replacement
- Relay Replacement (Attached to Wire Harness) Relay Replacement (Within an Electrical Center) Verification Tests



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