• | 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. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
Hazard Switch Signal | 1 | 1 | 1 | -- |
Hazard Flasher Signal | 2 | 2 | 2 | -- |
Instrument Panel Lamps Control | 3 | 3 | 3 | -- |
Hazard Switch Ground | -- | 1 | 1 | -- |
1. Hazard Lamps Malfunction 2. Hazard Lamp Indicators Malfunction 3. Interior Backlighting Malfunction |
The hazard flashers may be activated in any power mode. The hazard switch is permanently grounded through G201. When the hazard switch is placed in the ON position, ground is applied through the hazard switch signal circuit to the body control module (BCM). The BCM supplies battery voltage to all four turn signal lamps in an ON and OFF duty cycle. When the hazard switch is activated, the instrument panel cluster (IPC) hazard flasher signal circuit is grounded and the IPC request both turn signal indicators to be cycled ON and OFF.
Exterior Lighting Systems Description and Operation
Control Module References for scan tool information
⇒ | If the test lamp does not illuminate, test the ground circuit for an open/high resistance. |
⇒ | If not the specified value, test the signal circuit terminal 1 for a short to ground. If the circuit tests normal, replace the BCM. |
⇒ | If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM. |
⇒ | If the test lamp does not illuminate, test the ground circuit for an open/high resistance. |
⇒ | If the test lamp does not illuminate, test the signal circuit for a short to ground or an open/high resistance. |
⇒ | If the hazard flashers are not illuminated, test the signal circuit for a short to voltage. If the circuit tests normal, replace the IPC. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for BCM or IPC replacement, setup, and programming |