Circuit Description
The remote keyless entry keyfob sends a radio signal to the body control module (BCM) to lock all of the doors when the keyfob lock button is pressed. When the BCM receives the lock signal, the BCM applies battery voltage to the door lock relay control circuit . Ground for the door lock relay is supplied at all times.
Conditions for Running the DTC
The remote keyless entry keyfob lock button is pressed to lock the doors.
Conditions for Setting the DTC
| • | The BCM receives the lock signal from the keyfob. |
| • | The door lock relay control circuit is shorted to ground for 250 milliseconds. |
Action Taken When the DTC Sets
The BCM disables the door lock relay control output for the remainder of the ignition cycle.
Conditions for Clearing the DTC
| • | A current DTC B3137 will clear when the malfunction is no longer present and the ignition switch is cycled. |
| • | All BCM history codes clear after 100 ignition cycles with no current codes active during the 100 ignition cycles. |
Diagnostic Aids
| • | If the door lock relay control circuit is open, the keyfob will be unable to lock the doors, but the door mounted switch will operate properly. |
| • | Pressing the door lock switch while the door lock relay control circuit is shorted to ground is a direct short to battery and will blow the PWR ACC fuse. |
Test Description
The number(s) below refer to the step number(s) on the diagnostic table.
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Listen for an audible click when the door lock relay operates. Command both the ON and OFF states. Repeat the commands as necessary.
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Verifies that the BCM is providing voltage to the door lock relay.
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Tests for an open in the ground circuit to the door lock relay.
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Tests if voltage is constantly being applied to the door lock relay.
Step | Action | Yes | No |
|---|---|---|---|
1 | Did you perform the Door Systems Diagnostic System Check? | Go to Step 2 | |
Does the door lock relay turn ON and OFF with each command? | Go to Diagnostic Aids | Go to Step 3 | |
Does the test lamp turn ON and OFF with each command? | Go to Step 4 | Go to Step 5 | |
Does the test lamp turn ON and OFF 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 control circuit of the door lock relay for a short to ground or an open. 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 control circuit of the door lock relay 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 | Inspect for poor connections at the 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 13 | Go to Step 11 |
9 | Inspect for poor connections at the harness connector of the BCM. 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 relay. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 13 | -- |
11 | Replace the door lock relay. Did you complete the replacement? | Go to Step 13 | -- |
12 |
Important: Perform the setup procedure for the BCM. Refer to Body Control Module (BCM) Programming/RPO Configuration . Replace the BCM. Refer to Body Control Module Replacement in Body Control System. Did you complete the replacement? | Go to Step 13 | -- |
13 |
Does the DTC reset? | Go to Step 2 | System OK |
