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.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC 008 Lost communication with Remote Control Door Lock Receiver module.
Conditions for Running the DTC
The system voltage is at least 9 volts and no more than 16 volts.
Conditions for Setting the DTC
The BCM will set DTC 008 whenever the BCM detects a lack of communication with the RCDLR, including any of the following conditions:
| • | The RCDLR B+ supply is open or shorted to ground. |
| • | The RCDLR ground circuit is open or has high resistance. |
| • | 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 power sliding door 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 DTC Clearing. Refer to On-Board Diagnostic Features
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 numbers below refer to the step numbers on the diagnostic table.
-
Tests for an open, poor connection, or short to ground in the keyless entry serial data circuit. A measurement of B+ indicates good circuit continuity.
-
Tests for an short to voltage in the keyless entry serial data circuit. Illumination of an INCANDESCENT test lamp indicates a short to voltage. A LED circuit tester may give an incorrect indication.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: Keyless Entry Schematics | ||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
2 | Press each button of the transmitter one at a time. Does the system operate normally? | -- | Go to Diagnostic Aids | Go to Step 3 |
3 |
Does the test lamp illuminate? | -- | Go to Step 4 | Go to Step 12 |
4 | Connect a test lamp between the battery positive voltage circuit of the RCDLR and the RCDLR ground circuit. Does the test lamp illuminate? | -- | Go to Step 5 | Go to Step 13 |
With a DMM, measure the voltage from the keyless entry serial data circuit of the RCDLR to a good ground. Does the voltage measure near the specified value? | B+ | Go to Step 6 | Go to Step 7 | |
Does the test lamp illuminate? | -- | Go to Step 11 | Go to Step 9 | |
7 | 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 16 | Go to Step 8 |
8 | 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 16 | Go to Step 10 |
9 | 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 16 | Go to Step 15 |
10 | Inspect for poor connections at the harness connector of the body control module (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 16 | Go to Step 14 |
11 | 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 16 | -- |
12 | Repair the open, high resistance , or short to ground in the battery positive voltage circuit of the RCDLR. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 16 | -- |
13 | Repair the open or high resistance in the RCDLR ground circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 16 | -- |
14 | Replace the BCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the repair? | -- | Go to Step 16 | -- |
15 | Replace the RCDLR. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the repair? | -- | Go to Step 16 | -- |
16 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
