Turn Signal Lamps and/or Indicators Inoperative
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
Turn Signal Lamps and/or Indicators Inoperative
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Exterior Lights Schematics Connector End View Reference: Master Electrical Component List |
|||
| 1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle |
| 2 |
|
Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 3 |
| 3 | Is only one lamp inoperative? | Go to Step 4 | Go to Step 6 |
| 4 | Place a test lamp between the supply voltage and ground circuits at the inoperative lamp socket or connector. Does the test lamp illuminate when the turn signal is activated? |
Go to Step 14 | Go to Step 5 |
| 5 | Test for an open or high resistance in the supply voltage circuit or ground circuit of the inoperative lamp. Refer to Circuit Testing
and Wiring Repairs
. Did you find and correct the condition? |
Go to Step 15 | Go to Step 10 |
| 6 | With a scan tool, activate each turn signal with the body control module (BCM) output control function. Do all lamps operate correctly? |
Go to Step 8 | Go to Step 7 |
| 7 | Are only the instrument panel (I/P) turn signal indicators inoperative? | Go to Step 11 | Go to Step 9 |
| 8 | Test for one of the following conditions. Refer to Circuit Testing
and Wiring Repairs
.
Did you find and correct the condition? |
Go to Step 15 | Go to Step 12 |
| 9 | Test for a short to ground in the supply voltage circuits of the inoperable lamps. Refer to Circuit Testing
and Wiring Repairs
. Did you find and correct the condition? |
Go to Step 15 | Go to Step 10 |
| 10 | Test for a poor connection at the harness connector at the BCM, driver door switch, or passenger door switch as applicable. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
. Did you find and correct the condition? |
Go to Step 15 | Go to Step 13 |
| 11 | Replace the instrument panel cluster (IPC). Refer to Control Module References
for replacement, setup, and programming. Did you complete the replacement? |
Go to Step 15 | - |
| 12 | Replace the multifunction turn signal switch. Refer to Turn Signal Multifunction Switch Replacement
. Is the replacement complete? |
Go to Step 15 | - |
| 13 | Replace the BCM, driver door switch, or passenger door switch as applicable. Refer to Control Module References
for replacement, setup, and programming. Did you complete the repair? |
Go to Step 15 | - |
| 14 | Replace the inoperative turn signal lamp. Refer to the appropriate replacement procedure. Did you complete the repair? |
Go to Step 15 | - |
| 15 |
|
System OK | Go to Step 3 |