Circuit Description
The remote control door lock receiver (RCDLR) communicates with the body control module (BCM) through the keyless entry serial data circuit. When any button on the keyless entry transmitter is pressed, the transmitter sends a signal to the RCDLR. The RCDLR sends a lock or unlock request to the BCM, depending on which button is pressed on the transmitter. On vehicles equipped with content theft deterrent (CTD), the RCDLR may also send a panic alarm request to the BCM. The BCM receives the message and performs the appropriate function. The BCM also uses the keyless entry serial data circuit in order to communicate with the RCDLR when programming transmitters.
Conditions for Running the DTC
The system voltage is at least 9.0 volts and no more than 16.0 volts.
Conditions for Setting the DTC
The BCM will set DTC 8 under any of the following conditions:
| • | The BCM detects an open in the keyless entry serial data circuit. |
| • | The BCM detects a short to ground in the keyless entry serial data circuit. |
| • | The BCM detects a short to voltage in the keyless entry serial data circuit. |
Action Taken When the DTC Sets
The keyless entry system will not operate. (The rear compartment lid release will continue to operate with the keyless entry transmitter.)
Conditions for Clearing the DTC
A DTC will clear when the fault is no longer present and the DTCs are cleared as described in Diagnostic Trouble Code (DTC) Clearing. Refer to On-Board Diagnostic Features in Body Control System.
Diagnostic Aids
Perform a visual inspection for loose or poor connections at all related components. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
Test Description
The number(s) below refer to the step number(s) on the diagnostic table.
-
Tests for an open, poor connection, or short to ground in the keyless entry serial data circuit.
-
Tests for an short to voltage in the keyless entry serial data circuit.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: Keyless Entry Schematics | ||||
1 | Did you perform the body control module (BCM) Diagnostic System Check? | -- | Go to Step 2 | Go to Diagnostic System Check - Body Control System in Body Control System |
2 | Press each button of the transmitter one at a time. Does the system operate normally? | -- | Go to Diagnostic Aids | Go to Step 3 |
Does the voltage measure near the specified value? | B+ | Go to Step 4 | Go to Step 5 | |
Does the test lamp illuminate? | -- | Go to Step 9 | Go to Step 7 | |
5 | Test the keyless entry serial data circuit for a high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 12 | Go to Step 6 |
6 | Test the keyless entry serial data circuit 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 12 | Go to Step 8 |
7 | Inspect for poor connections at the harness connector of the RCDLR. 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 12 | Go to Step 11 |
8 | 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 12 | Go to Step 10 |
9 | Repair the short to voltage in the keyless entry serial data circuit. Refer to Circuit Testing or Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 12 | -- |
10 |
Important: Perform the BCM programming procedure when replacing the BCM. Replace the BCM. Refer to Body Control Module Replacement in Body Control System. Did you complete the repair? | -- | Go to Step 12 | -- |
11 |
Important: Perform the RCDLR programming procedure when replacing the RCDLR. Refer to Transmitter Programming . Replace the RCDLR. Refer to Remote Control Door Lock Receiver Replacement . Did you complete the repair? | -- | Go to Step 12 | -- |
12 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
