GM Service Manual Online
For 1990-2009 cars only

Diagnostic Instructions

    • Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
    • Review Strategy Based Diagnosis for an overview of the diagnostic approach.
    •  Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

F. PARK Fuse B+

1

1

--

--

Left Cornering Lamp Control

2

2

2

--

Right Cornering Lamp Control

2

2

2

--

Left Cornering Lamp Ground

--

1

--

--

Right Cornering Lamp Ground

--

1

--

--

1. Turn Signal Malfunction

2. Turn Signal Switch Malfunction

Circuit/System Description

The turn signal switch sends battery positive voltage to the cornering lamps which will constantly remain illuminated until turn signal operation is cancelled. The cornering lamps are grounded at G103 and G107.

Diagnostic Aids

Verify normal operation of the park lamps.

Reference Information

Schematic Reference

Exterior Lights Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Exterior Lighting Systems Description and Operation

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector X1 at the turn signal/multifunction switch.
  2. Ignition ON, and park lamp switch ON, verify that a test lamp illuminates between the park lamp control circuit terminal E and ground.
  3. If the test lamp does not illuminate, test the park lamp control circuit for a short to ground or an open/high resistance.
  4. Connect the harness connector X1 at the turn signal/multifunction switch.
  5. Disconnect the harness connector at the inoperative cornering lamp bulb.
  6. Test for less than 5.0 ohms between the ground circuit terminal G and ground.
  7. If greater than the specified range, test the ground circuit for an open/high resistance.
  8. Connect a test lamp between the inoperative cornering lamp control circuit terminal A and ground. Turn signal ON, the test lamp should illuminate
  9. If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the Turn Signal/Multifunction Switch.
  10. If all circuits test normal, replace the turn signal/multifunction switch.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Cornering Lamp Bulb Replacement
    •  Turn Signal Multifunction Switch Replacement