Circuit Description
The circuit for the LH Rear Power Window consists of:
| • | LH Rear Power Window Switch |
| • | LH Rear Door Module (LRDM) |
| • | Simple Bus Interface (SBI) |
| • | LH Front Door Module (LFDM) |
The LH Rear Power Window Switch provides input to the LH Rear Door Module. The LRDM contains a software program to sample the window switch and to report all switch activity in the form of SBI messages to the LFDM. The actual diagnostic software program for DTC B3287 is contained in the LFDM and the diagnostic is run no less than once every 300 milliseconds. Problems involving the LFDM or the SBI may set other DTC and will affect the operation of the power door locks and outside rearview mirrors.
Conditions for Setting the DTC
If the LFDM detects that the SBI messages from the LRDM show that the LH Rear Window Express Switch has been in the DOWN position for 15 continuous seconds, this DTC will be set current. This diagnostic will not run if either DTC B1982 (Battery Voltage High) or B1983 (Battery Voltage Low) are current.
Action Taken When the DTC Sets
This DTC is dynamic, and as such, is current only while the problem is present. While this DTC is current, the LRDM will ignore any actuation of the LH Rear Power Window Express Switch.
Conditions for Clearing the DTC
| • | This DTC will set from current to history when the window DOWN input cycles off or the power mode changes from OFF to RUN. |
| • | The history DTC will clear after 50 ignition cycles. |
| • | The scan tool or the vehicle On Board Diagnostic System can be used to clear the history DTC. |
Diagnostic Aids
| • | A history DTC is evidence of a intermittent problem. |
| • | If DTC B3287 is current, cycle the ignition switch from OFF to RUN. If this DTC is still current, perform the following diagnostic. |
Test Description
The numbers below refer to the step numbers on the diagnostic table:
-
This step tests the RH front power window switch for an internal short.
-
This step tests CKT 2765 for a short to ground.
-
This repair procedure requires the repair CKT 2765 for a short to ground.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was the Power Door System Diagnostic System Check performed? | -- | Go to Step 2 | |
Does the scan tool indicate DOWN? | -- | Go to Step 4 | Go to Step 3 | |
3 | Replace the LH rear power window switch. Refer to Rear Side Door Window Switch Replacement . Is the repair complete? | -- | Go to Step 7 | -- |
Is the resistance within the specified range? | 0-5 ohms | Go to Step 5 | Go to Step 6 | |
Repair CKT 2765 for a short to ground. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Step 7 | -- | |
6 | Replace the LR door module. Refer to Door Control Module Replacement . Is the replacement complete? | -- | Go to Step 7 | -- |
7 |
Are all DTCs cleared? | -- | -- |
