Circuit Description
The Body Control Module (BCM) is connected to the Remote Control Door Lock Receiver by a communication circuit. This data link circuit is how the Remote Control Door Lock Receiver tells the BCM to operate certain functions. The BCM also utilizes this communication circuit to reprogram transmitters.
Conditions for Running the DTC
The Remote Control Door Lock Receiver must have sent a second Programming Mode/Diagnostic Mode acknowledgment to the BCM. This condition can only happen when transmitter programming occurs.
Conditions for Setting the DTC
The BCM does not receive an acknowledgment message after 0.3 seconds from the Remote Control Door Lock Receiver after requesting a Programming Mode/Diagnostic Mode request.
Action Taken When the DTC Sets
The BCM stores DTC B1003 in memory.
Conditions for Clearing the DTC
| • | A current DTC B1003 will clear if the short to battery or open in the communication circuit is no longer detected by the BCM. |
| • | A history DTC B1003 will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present. |
| • | A scan tool may be used to clear the DTC. |
Diagnostic Aids
If the DTC B1003 is a history DTC, the fault may be intermittent. Refer to Testing for Intermittent Conditions and Poor Connections .
Test Description
The number(s) below refer to the step number(s) on the diagnostic table.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform the Remote Keyless Entry Diagnostic System Check? | -- | Go to Step 2 | |
2 |
Does the test lamp illuminate? | -- | Go to Step 3 | Go to Step 4 |
Test the RFA Serial Data Link circuit 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 8 | Go to Step 5 | |
4 | Inspect for poor connections at the harness connector of the Remote Control Door Lock Receiver. 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 8 | Go to Step 6 |
5 | Inspect for poor connections at the harness connector of the Body Control Module. 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 8 | Go to Step 7 |
6 |
Important: All transmitters which are to be recognized by the Remote Control Door Lock receiver must be programmed in a single programming sequence. If the system is placed in program mode it will erase all previously programmed transmitters upon the receipt of the programming signal from the first transmitter Replace the Remote Control Door Lock Receiver. Refer to Remote Control Door Lock Receiver Replacement . Did you complete the replacement? | -- | Go to Step 8 | -- |
7 |
Did you complete the replacement? | -- | Go to Step 8 | -- |
8 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
