PRE-RELEASE
Hazard Lamps Malfunction
| Hazard Lamps Malfunction |
| 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
has overviews of all diagnostic categories.
|
|
| Diagnostic Fault Information |
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|
Hazard Switch Signal
|
2
|
1
|
1
|
-
|
|
Hazard Switch Indicator Signal
|
3
|
3
|
4
|
-
|
|
Hazard Switch Ground
|
-
|
1, 2
|
-
|
-
|
|
1. Hazard Lamps Inoperative
2. Hazard Lamps Always ON 3. Hazard Switch Indicator Inoperative 4. Hazard Switch Always ON |
||||
| Circuit/System Description |
The hazard flashers may be activated in any power mode. The hazard warning switch is permanently grounded. 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 turn signal lamps in an ON and OFF duty cycle. When the hazard switch is activated, the BCM sends a serial data message to the instrument cluster requesting both turn signal indicators to be cycled ON and OFF.
| 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 information on diagnostic tools
| Circuit/System Testing |
Hazard Lamps Malfunction
| 1. |
Ignition OFF, disconnect the harness connector at the S26 Hazard Lamps Switch.
|
|
| 2. |
Ignition OFF, verify a test lamp illuminates between B+ and the ground circuit terminal 1.
|
|
| 3. |
If the test lamp does not illuminate, test the ground circuit for an open circuit/high resistance.
|
|
| 4. |
Ignition ON, verify the scan tool Hazard Lamp Switch parameter is INACTIVE.
|
|
| 5. |
If not the specified value, test the signal circuit terminal 4 for a short to ground. If the circuit tests normal, replace the K9 Body Control Module.
|
|
| 6. |
Install a 3 A fused jumper wire between the signal circuit terminal 4 and ground. Verify the scan tool Hazard Lamp Switch parameter is ACTIVE.
|
|
| 7. |
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 K9 Body Control Module.
|
|
| 8. |
If all circuits test normal, replace the S26 Hazard Lamps Switch.
|
|
Hazard Switch Indicator Malfunction
| 1. |
Ignition OFF, disconnect the harness connector at the S26 Hazard Lamps Switch.
|
|
| 2. |
Ignition OFF, verify a test lamp illuminates between B+ and the ground circuit terminal 1.
|
|
| 3. |
If the test lamp does not illuminate, test the ground circuit for an open circuit/high resistance.
|
|
| 4. |
Ignition ON, test for greater than 11 V between the circuit terminal 5 and the ground.
|
|
| 5. |
If less than the specified value, test the circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.
|
|
| 6. |
Ignition OFF, install a 3 A fused jumper wire between the signal circuit terminal 4 and ground.
|
|
| 7. |
If all circuits test normal, replace the S26 Hazard Lamps Switch.
|
|
Hazard Lamp Indicators Malfunction
Ignition ON, command the All Indicators test ON and OFF with the scan tool, verify both turn signal indicators changes between turn ON and OFF.| Repair Instructions |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • |
Hazard Warning Switch Replacement
|
|
| • |
Control Module References
for BCM or instrument cluster replacement, setup, and programming
|
|
