This vehicle is equipped with an on-board diagnostic feature capable of performing
the following functions:
• | Input/Output Diagnostics |
Feature Customizing Mode
The feature customizing mode is used to configure the BCM to function in various
applications. The BCM can be customized to change the following vehicle functions:
• | Interior Lighting Features |
• | Content Theft Deterrent System |
In order to enter the feature customizing mode perform the following steps:
- Turn the ignition switch to the LOCK position.
- Remove the BCM PRGRM fuse.
- Turn the ignition switch to the ACC position.
When entering the feature customizing mode, the BCM first identifies what type
of BCM is installed on the vehicle by flashing the fasten seat belts indicator and
sounds the chime 2, 3 or 4 times depending on the type of BCM used on the vehicle.
There are 3 different types of BCM that can be installed on the vehicle based on
the vehicle option content that matches the BCM capabilities. Ensure that the BCM
installed on the vehicle is compatible with all of the features on the vehicle. Refer
to
Body Control System Description and Operation
for BCM identification.
For more information on features that can be customized, refer to
Personalization Description and Operation
in Personalization.
Displaying DTC Codes
The DTC codes can be displayed by entering the diagnostics mode. Clearing DTC
codes and Input/Output Diagnostics are also available in the diagnostics mode.
Complete the following steps in order to enter the diagnostics mode:
- Turn the ignition switch to the LOCK position.
- Remove the BCM PRGRM fuse.
- Turn the ignition switch to the ACC position.
- Quickly turn the ignition switch from the ACC position to the LOCK position
then back to the ACC position within 1 second.
The BCM will enter the on-board diagnostic mode and flash the fasten seat belts
indicator and sound the chime equal to the number of DTCs stored in the BCM memory.
If no DTCs are stored, the BCM will not flash the fasten seat belts indicator or
activate the chime.
The BCM flashes and sounds the first DTC with the lowest number, pauses, then
continues with the next DTC until all of the DTCs are read. With a DTC 1,
the BCM will only sound the chime once, and the fasten seat belts indicator may
not flash. Once all of the DTCs are read, the BCM repeats this sequence 3 times.
Important: If the fasten seat belts indicator does not flash, and the chime does not sound,
complete the following procedure in order to confirm that the BCM has entered the
diagnostics mode:
- Ensure that all of the vehicle doors are closed.
- Open and close any vehicle door.
- Fasten and release the driver seat belt.
The BCM sounds the chime when receiving an input signal such as Drivers door,
Passengers door opening or turning on the courtesy lights when the BCM is in the
diagnostics mode. Make sure these inputs are working correctly in order to prevent
a false diagnoses.
If the BCM does not sound the chime upon opening a door or turning on the courtesy
lights, repeat Step 1 of Entering the diagnostics mode. If the BCM does not
enter the diagnostics mode, then refer to
Cannot Enter BCM Diagnostics
.
Clearing DTC Codes
After entering the diagnostics mode press and hold the Unlock switch for 4 seconds.
The BCM will erase all history DTC codes. If a circuit is still shorted, the BCM
will immediately store a history DTC code.
Input/Output Diagnostic Mode
After the BCM reads all of the DTCs in the memory, the BCM enters the Input/Output
Diagnostic Mode.
The BCM flashes the fasten seat belts indicator and sounds the chime once when
any of the following inputs are activated:
• | Door lock cylinder switches |
• | Driver door ajar switch |
• | IP compartment lamp switch |
• | Keyless entry request for door lock/unlock |
• | Keyless entry request for the alarm (RPO UA6) |
• | Passenger door ajar switch |
• | Power door lock switches |
• | Sliding door ajar switches |
Perform the following procedure in order to test the BCM outputs:
- Ensure that the BCM is in the diagnostic mode. Refer to Entering On-Board
Diagnostic Mode.
- Cycle the interior light switch ON then OFF.
- The BCM will enter the Output Diagnostic Test Mode 1.
- Each cycle of the interior light switch ON/OFF will select from following
test modes depending on BCM type:
• | Test Mode 1-- De-activates the courtesy lights output and removes
power to all of the interior lamps. |
• | Test Mode 2-- Activates the courtesy lights output and provides
power to all of the interior lamps. Interior lamp override switch must be ON. |
• | Test Mode 3-- Activates the courtesy lights output and turns ON
all of the courtesy lamps. Interior lamp switch must be ON. |
• | Test Mode 4-- Activates the theft deterrent relay for 1 second
and turns ON the headlamps. BCM type 4 only. |
• | Test Mode 5-- Energizes the horn relay for 25 ms. BCM type 4
only. |
• | Test Mode 6-- Turns on the security LED indicator. BCM type 4
only. |
• | Test Mode 7-- Turns off the security LED indicator. BCM type 4
only. |
When the BCM completes all test modes, the BCM will repeat the test mode sequence.
Exiting Diagnostics
Perform the following procedure in order to exit the BCM diagnostics mode and
return to normal BCM operation:
- Turn the ignition switch to the LOCK position.
- Reinstall the BCM PRGRM fuse.
- Turn the ignition switch to the RUN position.