Circuit Description
The Body Control Module (BCM) controls the unlocking function of the door locks. The BCM grounds the door lock feed circuit and switches battery power to the door unlock feed circuit, which in turn energizes all of the door lock motors (except the drivers door lock motor) to unlock.
Conditions for Running the DTC
The BCM must not be commanding all of the door lock motors (except the drivers door lock motor) to unlock.
Conditions for Setting the DTC
| • | The BCM detects a short to battery in the door unlock feed circuit when it is not commanding all of the door lock motors (except the drivers door lock motor) to unlock. |
| • | The condition above must be present for more than 0.3 seconds. |
Action Taken When the DTC Sets
The BCM stores DTC B3133 in memory.
Conditions for Clearing the DTC
| • | A short to battery in the door unlock feed circuit is no longer detected by the BCM. |
| • | A history DTC B3133 will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present. |
| • | A scan tool may be used to clear the DTC. |
Diagnostic Aids
| • | If the DTC B3133 is a history DTC, the fault may be intermittent. Refer to Intermittents and Poor Connections. |
| • | The following conditions may cause an intermittent malfunction to occur: |
| - | An intermittent short to battery in the door unlock feed circuit |
| - | One of the door lock motors is intermittently shorted to battery internally |
| - | The BCM is intermittently shorted to battery internally |
Test Description
The number(s) below refer to the step number(s) on the diagnostic table.
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Listen for an audible noise when the door lock motors are commanded to unlock . Command the door lock motors to lock and unlock. Repeat the commands as necessary.
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Verifies that the Body Control Module is providing voltage to the door lock motors. Check the door lock fuse before this step is performed.
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Tests for an open in the ground circuit to the door lock motors.
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Tests if voltage is constantly being applied to the door lock motors.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform the Diagnostic System Check for the door system? | -- | Go to Step 2 | |
Do the door lock motors lock and then unlock with each command? | -- | Go to Diagnostic Aids | Go to Step 3 | |
Does the test lamp flash when the door lock motors are commanded to unlock? | -- | Go to Step 4 | Go to Step 5 | |
Does the test lamp flash with each command? | -- | Go to Step 8 | Go to Step 10 | |
Does the test lamp remain illuminated with each command? | -- | Go to Step 7 | Go to Step 6 | |
6 | Test the unlock control circuit of door lock motors for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 13 | Go to Step 9 |
7 | Test the unlock control circuit of the door lock motors for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 13 | Go to Step 9 |
8 | Check the unlock control circuit in each door harness for a short to ground if the DTC B3132 is set or a short to battery if the DTC B3133 is set. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 13 | Go to Step 11 |
9 | 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 13 | Go to Step 12 |
10 | Repair the ground circuit of the door lock motor on the body harness side. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 13 | -- |
11 | Find and replace the defective door lock motor. Refer to Front Side Door Lock Actuator Replacement or Rear Side Door Lock Actuator Replacement . Did you complete the repair? | -- | Go to Step 13 | -- |
12 |
Did you complete the replacement? | -- | Go to Step 13 | -- |
13 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
