Circuit Description
The intermittent switch in the windshield wiper washer switch is a voltage divider connected across the body control module (BCM) inputs circuits windshield wiper switch signal 1 circuit and windshield wiper switch signal 2 circuit. The front wiper relay is energized by the BCM switching the front wiper relay control circuit to ground.
The intermittent wiper delay switch has 3 switch positions.
| • | Delay 1 (500 ohms resistance) |
| • | Delay 2 (1000 ohms resistance) |
| • | Delay 3 (2000 ohms resistance) |
Refer to Wiper/Washer System Description and Operation for the timing of each delay position.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC B3702 Intermittent Wiper Delay Input Circuit Low
Conditions for Running the DTC
The ignition is in RUN or ACC position.
Conditions for Setting the DTC
The windshield wiper switch signal 1 circuit is shorted to ground or less than 0.2 volts.
Actions Taken When the DTC Sets
| • | No light will illuminate in the instrument panel (I/P). |
| • | Cannot vary wiper speed. |
| • | B3702 is set in BCM. |
Conditions for Clearing the DTC
| • | A current DTC clears when the fault is no longer present. |
| • | A history DTC clears when the module ignition cycle counter reaches the reset threshold, without a repeat of the fault. |
Diagnostic Aids
| • | Inspect wiring harness for damage. Check for broken or chaffed insulation. |
| • | If a fault is suspected to be intermittent, wiggling the harness wiring may help in locating the fault. |
| • | Check for a poor connection at the BCM. Inspect harness connectors for backed out terminals, improper terminal mating, broken connector locks, improperly formed or damaged terminals, and poor terminal-to-wire connection (terminal crimped over wire insulation and not conductors). |
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Wiper/Washer Schematics Connector End View Reference: Master Electrical Component List in Wiring Systems | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
2 |
Is the voltage less than 0.4 volts? | Go to Step 3 | Go to Diagnostic Aids |
3 |
Is the voltage greater than 4.5 volts? | Go to Step 6 | Go to Step 4 |
4 |
Is there continuity? | Go to Step 5 | Go to Step 7 |
5 | Repair a short to ground in the windshield wiper switch signal 1 circuit or windshield wiper switch signal 2 circuit. Refer to Wiring Repairs or Connector Repairs in Wiring Systems. Did you complete the repair? | Go to Step 8 | -- |
6 | Replace the windshield wiper washer switch. Refer to Turn Signal Multifunction Switch Replacement in Steering Wheel and Column. Did you complete the replacement? | Go to Step 8 | -- |
7 | Replace the BCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | Go to Step 8 | -- |
8 |
Does the DTC reset? | Go to Step 2 | System OK |
