Circuit Description
The remote keyless entry keyfob sends a radio signal to the body control module (BCM) to lock 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
Voltage supplied to the body control module is in the normal operating range (approximately 9-16 volts).
Conditions for Setting the DTC
The door lock relay control circuit is shorted to battery voltage for 30 seconds.
Action Taken When the DTC Sets
All door lock and unlock functions are inoperative from the keyfob as long as the malfunction is present.
Conditions for Clearing the DTC
| • | A current DTC B3138 will clear when the malfunction is no longer present. |
| • | All BCM history codes clear after 100 ignition cycles with no current codes active during the 100 ignition cycles. |
Diagnostic Aids
Pressing and holding the door lock switch for 30 seconds will also set this DTC.
Test Description
The number(s) below refer to the step number(s) on the diagnostic table.
-
Listen for an audible click when the door lock relay operates. Command both the ON and OFF states. Repeat the commands as necessary.
-
Verifies that the BCM is providing voltage to the door lock relay.
-
Tests for an open in the ground circuit to the door lock relay.
-
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 |
