For a full page schematic, refer to Door Lock/Indicator Schematics .
Circuit Description
The body control module (BCM) monitors and supplies an output voltage on the door unlock control circuit. When the BCM receives an unlock command from the remote control door lock receiver or when the ignition key is removed after an automatic door lock function has been activated, the BCM supplies voltage on the door unlock control circuit to unlock the passenger door(s).
Conditions for Running the DTC
| • | The system voltage must be between 9.0 and 16.0 volts. |
| • | The BCM supplies a voltage signal on the door unlock control circuit. |
Conditions for Setting the DTC
| • | When the BCM supplies a voltage signal on the door unlock control circuit and the door unlock control circuit is shorted to ground. |
| • | The above conditions must be met for 250 milliseconds. |
Action Taken When the DTC Sets
| • | The door lock system will not unlock the passenger door(s) from the keyless entry transmitter. |
| • | The door lock switches will not unlock the doors. |
| • | The automatic door locks will not operate. |
Conditions for Clearing the DTC
| • | A current DTC will clear after the next fault free ignition cycle. |
| • | A history DTC will clear after 100 consecutive ignition cycles without a fault present. |
Diagnostic Aids
| • | Always begin diagnosis with the first DTC listed on the scan tool. |
| • | Perform a visual check for loose or poor connections at all related components |
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 Unlock Relay operates. Command both the ON and OFF states. Repeat the commands as necessary.
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Verifies that the Body Control Module (BCM) is providing voltage to the door unlock relay.
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Tests for an open in the ground circuit to the door unlock relay.
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Tests if voltage is constantly being applied to the door unlock relay.
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After replacement of the BCM you must calibrate the new module for proper operation.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform the Power Door Systems Diagnostic System Check? | -- | Go to Step 2 | |
Does the door unock relay turn ON and OFF with each command? | -- | Go to Testing for Intermittent Conditions and Poor Connections | 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 unlock relay 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 control circuit of the door unlock 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 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 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 unlock relay . Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 13 | -- |
11 | Replace the door unlock relay . Did you complete the replacement? | -- | Go to Step 13 | -- |
Did you complete the replacement? | -- | Go to Step 13 | -- | |
13 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
