For 1990-2009 cars
Keyless Entry Component Views
Keyless Entry Schematics
Handling ESD Sensitive Parts Notice
Handling ESD Sensitive Parts Notice
Power Distribution Schematics

### Circuit Description

The Body Control Module (BCM) is connected to the Remote Control Door Lock Receiver by the keyless entry serial data circuit. This circuit is the link for communication between the two modules.

### Conditions for Running the DTC

The BCM is receiving a message from the remote control door lock receiver.

### Conditions for Setting the DTC

The BCM detects a short to voltage in the communication circuit.

### Action Taken When the DTC Sets

The BCM stores DTC B2803 in memory.

### Conditions for Clearing the DTC

• | The condition for setting the DTC is no longer present and the scan tool Clear DTCs function is used.

• | The BCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

### Diagnostic Aids

• | Thoroughly inspect the wiring and the connectors. An incomplete inspection of the wiring and the connectors may result in a misdiagnosis, causing a part replacement with a reappearance of the malfunction.

• | If an intermittent malfunction exists, 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.

1. This step checks for a short to voltage.

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Did you perform the Remote Keyless Entry Diagnostic System Check? | -- | Go to Step 2 | Go to Diagnostic System Check - Remote Keyless Entry
2 |

1. Turn OFF the ignition.
2. Disconnect the Remote Control Door Lock Receiver.
3. Connect a test lamp from the Keyless Entry Serial Data circuit to ground.
4. Turn ON the ignition, with the engine OFF.

Does the test lamp illuminate?

--

Go to Step 3

Go to Step 4

3 | Test the Keyless Entry Serial Data 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 Receiver Replacement .

Did you complete the replacement?

--

Go to Step 8

--

7 |

1. Replace the Body Control Module. Refer to Body Control Module Replacement in Body Control System.
2. Perform the set up procedure for the Body Control Module. Refer to Body Control Module (BCM) Programming/RPO Configuration in Body Control System.

Did you complete the replacement?

--

Go to Step 8

--

8 |

1. Use the scan tool in order to clear the DTCs.
2. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.

Does the DTC reset?

--

Go to Step 2

System OK