Circuit Description
The driver door module (DDM) provides output controls for the driver door switch illumination, memory 1 indicator, memory 2 indicator, LH mirror select indicator and the RH mirror select indicator. These output controls allow the DDM to illuminate the driver door switch back lighting, memory indicators and mirror select indicators. The DDM provides a single power supply for all illuminated light functions. The DDM uses a pulse-width modulated ground output to control the dimming level to the driver door switch back lighting lamp. The DDM also provides a ground output for the memory 1, memory 2, LH and RH mirror select switch indicators. The DDM provides a ground output to each of these indicators to illuminate the applicable indicator based upon the driver door switch signal information. The DDM monitors the amount of current draw on all of the illumination lamp control circuits. If the DDM detects an overcurrent condition for longer than 10 milliseconds, a DTC is set.
The passenger door module (PDM) provides an illuminated LED output control for the passenger door switch assembly. This output control allows the PDM to illuminate the switch assembly when the park lamps and/or headlamps are ON. The PDM provides power and a Pulse-Width Modulation (PWM) ground output to the passenger door switch. The PDM monitors the amount of current draw on the illumination lamp control circuit. If the PDM detects an overcurrent condition for longer than 10 milliseconds, a DTC is set.
Conditions for Setting the DTC
| • | The DDM or PDM detects an overcurrent condition in any one of the following door switch control circuits: |
| - | LH or RH mirror indicator |
| - | Memory 1 indicator |
| - | Memory 2 indicator |
| - | Driver or passenger door switch Illumination lamp |
| • | Condition must be present for longer than 10 milliseconds. |
Action Taken When the DTC Sets
| • | Stores a history DTC B2278 or B2279 in DDM or PDM memory. |
| • | The appropriate door module will disable the malfunctioning indicator. |
| • | These DTCs can only be set as a history code even if the malfunction is current. |
| • | No driver warning message will be displayed for this DTC. |
Conditions for Clearing the DTC
| • | The DDM or PDM no longer detects an overcurrent condition in any of the applicable indicator/lamp control circuits for longer than 10 milliseconds, and: |
| • | The DTC is cleared using the IPC clearing feature, or |
| • | The DTC is cleared using a scan tool. |
Diagnostic Aids
| • | The following conditions may cause an intermittent malfunction: |
| - | There is an intermittent short to voltage or ground in the following door switch illumination or indicator control circuits: |
| • | Driver or passenger door switch illumination lamp |
| • | Memory 1 select indicator |
| • | Memory 2 select indicator |
| • | LH mirror select indicator |
| • | RH mirror select indicator |
| - | The driver or passenger door switch indicator/lamp is shorted. |
| • | If the DTC does not reset after the code is cleared, then the problem may be intermittent. 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.
-
This tests if a door switch for an internal short to voltage or ground.
-
This tests a door switch illumination circuits for a short to voltage or ground.
Step | Action | Value(s) | Yes | No | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Schematic Reference: Door Control Module Schematics Connector End View Reference: Power Door Systems Connector End Views | ||||||||||||||
1 | Did you perform the Power Door Systems Diagnostic System Check? | -- | Go to Step 2 | |||||||||||
Does the DTC reset? | -- | Go to Step 3 | Go to Step 5 | |||||||||||
Test the following appropriate door switch illumination control circuits, if they apply, for a short to ground or voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition? | -- | Go to Step 6 | Go to Step 4 | |||||||||||
4 | Replace the appropriate door module. Refer to Door Control Module Replacement . Did you complete the replacement? | -- | Go to Step 6 | -- | ||||||||||
5 | Replace the appropriate door switch. Refer to Front Door Switch Replacement . Did you complete the replacement? | -- | Go to Step 6 | -- | ||||||||||
6 |
Does the DTC reset? | -- | Go to Step 2 | System OK | ||||||||||
