Circuit Description
The circuit for the Power Fold Switch on the LH Front Door consists of:
| • | LH Front Power Window Switch (LFPWS) Assembly |
| • | Simple Bus Interface (SBI) |
| • | RH Front Door Module (RFDM) |
| • | LH Front Door Module (LFDM) |
The LH Front Power Window Switch (LFPWS) Assembly is different from the other power window switches on the car in that it contains an internal microprocessor. This LFPWS Assembly reports all switch activity in the form of SBI messages to the LFDM. The actual diagnostic software program for DTC B1718 is contained in the LFDM and this diagnostic is run once every 300 milliseconds. Problems involving the RRDM or SBI may set other DTCs and affect the operation of the power door locks and outside rear view mirror.
Conditions for Setting the DTC
If the LFDM detects that the SBI messages from the LH Front Power Window Switch (LFPWS) Assembly shows that the Power Fold 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 set 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 LFDM will ignore the actuation of the Power Fold Switch.
Conditions for Clearing the DTC
| • | This DTC will be set from current to history when the Power Fold Switch 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 an intermittent problem, clear the DTC and cycle the ignition switch from OFF to RUN. Then perform the Diagnostic System Check. |
| • | If DTC B1718 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:
-
Perform the Power Door System Diagnostic System Check prior to continuing the diagnosis of this DTC.
-
This repair procedure requires power window switch replacement.
-
Clear all DTCs following repair procedure completion.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Was the Power Door System Diagnostic System Check performed? | -- | Go to Step 2 | ||
Replace the LH front power window switch. Refer to Front Door Switch Replacement . Is the repair complete? | -- | Go to Step 3 | -- | |
Are all DTCs cleared? | -- | -- |
