Circuit Description
The keyless entry system allows the driver to do the following functions from outside the vehicle by using a hand held radio transmitter:
| • | Unlock the door locks. The courtesy lights activate automatically when using this function. |
| • | Lock the door locks. |
| • | Release the rear compartment lid. |
| • | Remote alarm. |
The transmitter operates in the UHF band. The transmitter sends digitally coded signals to the Remote Control Door Lock Receiver (RCDLR) when pressing any of the transmitter buttons.
The RCDLR detects and decodes transmitter signals. For locking, unlocking, and remote alarm commands, the RCDLR sends command messages to the Body Control Module (BCM) to operate the door locks actuators, courtesy lights, and remote alarm.
Conditions for Setting the DTC
The BCM detects a short to B+ in circuit 917 while attempting to enable the transmitter programming/diagnostic mode.
Action Taken When the DTC Sets
| • | The BCM stores DTC B2803 in memory. |
| • | The RCDLR does not enter transmitter programming/diagnostic mode. |
Conditions for Clearing the DTC
| • | Current DTC B2803 clears automatically upon entering the transmitter programming/diagnostic mode. |
| • | A history DTC will clear after 100 consecutive ignition cycles if the condition for the fault is no longer present. |
| • | Using a scan tool. |
Diagnostic Aids
| • | The following conditions may cause an intermittent malfunction to occur: |
| • | An intermittent short to B+ in circuit 917. |
| • | An intermittent short to B+ in the BCM. |
| • | The RCDLR is shorted to B+ internally. |
| • | The BCM checks for DTC B2803 only when attempting to enable transmitter programming/diagnostic mode. Refer to Transmitter Programming in Keyless Entry for more information on how to enter this mode. |
| • | The problem may be intermittent. Try performing the tests shown while moving wiring and connectors. This can often cause the malfunction to reappear. |
| • | DTC P1626 will set in the Powertrain Control Module (PCM) when the ignition switch is on with the Body Control Module (BCM) disconnected. When BCM diagnostics and repairs are completed, refer to Powertrain On Board Diagnostic (OBD) System Check (LX5) or Powertrain On Board Diagnostic (OBD) System Check (L36) in Engine Controls for additional information on PCM related DTCs. |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
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This step checks for communication between the BCM and the RCDLR when using the keyless entry transmitter.
-
This step checks for communication between the BCM and the RCDLR when entering the transmitter programming/diagnostic mode.
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This step checks for a short to B+ in circuit 917.
-
This step checks for a faulty RCDLR.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was the BCM diagnostic system check performed? | -- | ||
Did the door locks lock and unlock by using the keyless entry transmitter? | -- | |||
Does DTC B2803 reset as a current or history DTC? | -- | |||
Is the voltage measured within the specified range? | Less than 2V | |||
Is the voltage measured within the specified range when the RFA link was active? | Less than 2V | |||
6 |
Is the repair complete? | -- | -- | |
7 | Repair short to B+ in circuit 917. Is the repair complete? | -- | -- | |
8 | Replace the RCDLR. Refer to Receiver Replacement in Keyless Entry for service procedure. Is the repair complete? | -- | ||
9 | The malfunction is not present at this time. Refer to Diagnostic Aids for additional information regarding this DTC. | -- | -- | -- |
10 |
Are there any BCM current DTCs set? | -- | System OK |
