Power Door Locks Inoperative (Rear Door(s))
WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Power Door Locks Inoperative (Rear Door(s))
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Door Lock/Indicator Schematics Connector End View Reference: Power Door Systems Connector End Views |
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| 1 | Did you perform the Door Systems Diagnostic System Check? | Go to Step 2 | Go to Diagnostic System Check - Door Systems |
| 2 | Activate the front door lock switches to the lock and unlock positions. Do both rear passenger doors lock and unlock? |
Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
| 3 | Is there only one door lock actuator that is inoperative? | Go to Power Door Locks Inoperative - One Door or Switch (without Power Windows) | Go to Step 4 |
| 4 | Are the rear door lock actuators inoperative for both lock and unlock? | Go to Step 6 | Go to Step 5 |
| 5 | Do the rear door lock actuators lock? | Go to Step 17 | Go to Step 12 |
| 6 | Is the LOCKS fuse open? | Go toStep 24 | Go to Step 7 |
| 7 |
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Go to Step 8 | Go to Step 27 |
| 8 |
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Go to Step 10 | Go to Step 9 |
| 9 |
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Go to Step 11 | Go to Step 27 |
| 10 |
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Go to Step 22 | Go to Step 26 |
| 11 |
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Go to Step 23 | Go to Step 25 |
| 12 |
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Go to Step 13 | Go to Step 27 |
| 13 | With the test lamp connected to a good ground, probe the lock relay control circuit cavity in the fuse block. Does the test lamp illuminate? |
Go to Step 22 | Go to Step 14 |
| 14 |
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Go to Step 15 | Go to Step 22 |
| 15 | With the test lamp connected to battery positive voltage, probe the door lock actuator lock control circuit cavity in the fuse block. Does the test lamp illuminate? |
Go to Step 25 | Go to Step 16 |
| 16 |
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Go to Step 26 | Go to Step 27 |
| 17 |
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Go to Step 18 | Go to Step 27 |
| 18 | With the test lamp connected to a good ground, probe the unlock relay control circuit cavity in the fuse block. Does the test lamp illuminate? |
Go to Step 23 | Go to Step 19 |
| 19 |
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Go to Step 20 | Go to Step 23 |
| 20 | With the test lamp connected to battery positive voltage, probe the door lock actuator unlock control circuit cavity in the rear fuse block. Does the test lamp illuminate? |
Go to Step 25 | Go to Step 21 |
| 21 |
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Go to Step 25 | Go to Step 27 |
| 22 | Test for an open short to ground or short to battery in the door lock relay lock control circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? |
Go to Step 33 | Go to Step 28 |
| 23 | Test for an open short to ground or short to battery in the door unlock relay lock control circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? |
Go to Step 33 | Go to Step 28 |
| 24 | Test for a short to ground in the door lock actuator lock and unlock control circuits. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? |
Go to Step 33 | Go to Step 27 |
| 25 | Inspect for poor connections at the rear door lock relay. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 33 | Go to Step 29 |
| 26 | Inspect for poor connections at the rear door unlock relay. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 33 | Go to Step 30 |
| 27 | Inspect for poor connections at the fuse block. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 33 | Go to Step 31 |
| 28 | Inspect for poor connections at the harness connector of the body control module. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
in Wiring Systems. Did you find and correct the condition? |
Go to Step 33 | Go to Step 32 |
| 29 | Replace the rear door lock relay. Did you complete the repair? |
Go to Step 33 | - |
| 30 | Replace the rear door unlock relay. Did you complete the repair? |
Go to Step 33 | - |
| 31 | Replace the rear fuse block. Did you complete the repair? |
Go to Step 33 | - |
| 32 | Replace the BCM. Refer to Body Control Module Replacement
in Body Control System. Did you complete the repair? |
Go to Step 33 | - |
| 33 | Operate the system in order to verify the repair. Did you correct the condition? |
System OK | Go to Step 2 |