Circuit Description
The switch power circuit to the rear wiper/washer switch is a 12-volt reference supplied by the body control module. The rear wiper/washer switch is a series of resistors and the switch position is determined by the voltage of the rear wiper/washer switch signal circuit to the body control module. The rear wiper/washer switch has continuity at all times and the body control module expects a rear wiper/washer switch signal voltage in all switch positions including OFF.
Conditions for Running the DTC
| • | Battery voltage must be between 9.0-16.0 volts. |
| • | The rear wiper/washer switch is active or inactive. |
Conditions for Setting the DTC
The rear wiper/washer switch signal circuit is higher or lower than normal switch operation allows.
Action Taken When the DTC Sets
| • | The DTC will be current for as long as the fault is present. |
| • | The rear wiper/washer system will be disabled for as long as the DTC is current. |
Conditions for Clearing the DTC
| • | The DTC status will change from current to history when the fault is no longer present. |
| • | A history DTC will be cleared after 100 error free ignition cycles. |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
This step verifies that the fault is current.
-
This step tests the resistance through the rear wiper switch. The measured resistance will be highest in the OFF position and reduce as the switch is turned from positions 1 through 3.
Step | Action | Value(s) | Yes | No | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Schematic Reference: Wiper/Washer Schematics | ||||||||||||
1 | Did you perform the Wiper/Washer System Diagnostic System Check? | -- | Go to Step 2 | |||||||||
Does the scan too indicate the correct requested rear wiper parameter in relation to the switch position? | -- | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 | |||||||||
Does the resistance remain within the specified values from high to low as the switch is operated through the listed switch positions? | 3100-1500 ohms | Go to Step 4 | Go to Step 8 | |||||||||
4 | While measuring the resistance through the rear wiper/washer switch from the switch power circuit terminal to the signal circuit terminal press the wash switch. Is the resistance near the specified value? | 1270 ohms | Go to Step 5 | Go to Step 8 | ||||||||
5 | Test the switch power circuit to the rear wiper/washer switch for an open, short to ground, or short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 11 | Go to Step 6 | ||||||||
6 | Test the rear wiper/washer switch signal circuit to the rear wiper switch for an open, short to ground, or short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 11 | Go to Step 7 | ||||||||
7 | Inspect for poor connections at the harness connector of the body control module. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 11 | Go to Step 9 | ||||||||
8 | Inspect for poor connections at the harness connector of the rear wiper/washer switch. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 11 | Go to Step 10 | ||||||||
9 |
Important: Replace the body control module and perform the programing procedure. Refer to Body Control Module Replacement and Body Control Module (BCM) Programming/RPO Configuration in Body Control System. Did you complete the replacement? | -- | Go to Step 11 | -- | ||||||||
10 | Replace the rear wiper/washer switch. Did you complete the replacement? | -- | Go to Step 11 | -- | ||||||||
11 |
Does the DTC reset? | -- | Go to Step 2 | System OK | ||||||||
