Test Description
The numbers below refer to the step numbers on the diagnostic table.
- 2: Lack of communication may be due to a partial malfunction of the class 2 serial data circuit or due to a total malfunction of the class function of the class 2 serial data circuit. The specified procedure will determine the particular condition.
- 4: The presence of DTCs which began with U indicate some other module is not communicating. The specified procedure will compile all the available information before tests are performed.
| Step | Action | Yes | No |
|---|---|---|---|
| 1 | Install a scan tool. Does the scan tool power up? | Go to Step 2 | Go to Scan Tool Does Not Power Up in Data Link Communications |
| 2 | Turn ON the ignition, with the engine OFF. Attempt to establish communication with the body control module (BCM). Does the scan tool communicate with the body control module? | Go to Step 3 | Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications |
| 3 | Select the display DTCs function on the scan tool for the BCM. Does the scan tool display any DTCs? | Go to Step 4 | Go to Symptoms - Wiper/Washer Systems |
| 4 | Does the scan tool display any DTCs which begin with a "U"? | Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications | Go to Step 5 |
| 5 | Does the scan tool display DTC B1000, B1001, B1372, or B1382? | Go to Diagnostic Trouble Code (DTC) List in Body Control System | Go to Step 6 |
| 6 | Does the scan tool display DTC B1327 or B1328? | Go to Diagnostic Trouble Code (DTC) List in Engine Electrical | Go to Diagnostic Trouble Code (DTC) List |
Diagnostic System Check - Wiper/Washer
The numbers below refer to the step numbers on the diagnostic table.
- 10: Listen for an audible click when the front wiper relay operates. Command both the ON and OFF states. Repeat the commands as necessary.
- 11: Verifies that the BCM is providing voltage to the front wiper relay.
| Step | Action | Yes | No |
|---|---|---|---|
| Connector End View Reference: Master Electrical Component List in Wiring Systems | |||
| 1 | Did you perform the Wiper/Washer Diagnostic System Check? | Go to Step 2 | Go to Diagnostic System Check - Wiper/Washer |
| 2 | Turn ON the ignition, with the engine OFF. Operate the windshield wiper washer switch through all the switch positions. Refer to Wiper/Washer System Description and Operation . Does the windshield wiper/washer system operate normally? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
| 3 | Are the wipers always on? | Go to Step 9 | Go to Step 4 |
| 4 | Turn OFF the ignition. Disconnect the front wiper relay in the underhood fuse block (UHFB). Turn ON the ignition, with the engine OFF. Connect a test lamp from the windshield wiper washer switch power circuit of the front wiper relay and a good ground. Does the test lamp illuminate? | Go to Step 5 | Go to Step 8 |
| 5 | Connect a test lamp from the windshield wiper washer switch power circuit and the front wiper relay control circuit of the front wiper relay. With a scan tool command the front wiper relay On and Off under body control module special functions. Does the test lamp follow the scan tool commands? | Go to Step 10 | Go to Step 6 |
| 6 | Test the front wiper relay control circuit for an open or a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 12 | Go to Step 7 |
| 7 | Inspect for poor connections at the harness connector of the BCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 12 | Go to Step 11 |
| 8 | Repair an open, high resistance, or the short to ground in the windshield wiper washer switch power circuit of the front wiper relay. Refer to Wiring Repairs or Connector Repairs in Wiring Systems. Did you complete the repair? | Go to Step 12 | |
| 9 | Repair a short to ground on the front wiper relay control circuit. Refer to Wiring Repairs or Connector Repairs in Wiring Systems. Did you complete the repair? | Go to Step 12 | |
| 10 | Replace the front wiper relay. Refer to Relay Replacement (Within an Electrical Center) Relay Replacement (Attached to Wire Harness) in Wiring Systems. Did you complete the replacement? | Go to Step 12 | |
| 11 | IMPORTANT: Perform the programming or setup procedure for the replaced control module if required. Replace the BCM. Refer to Body Control Module Replacement in Body Control System for applicable replacement procedure.Did you complete the replacement? | Go to Step 12 | |
| 12 | Use the scan tool to clear the DTCs. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text. Does the DTC reset? | Go to Step 2 | System OK |
| IMPORTANT |
|---|
| Perform the programming or setup procedure for the replaced control module if required. |
DTC B3715, B3716, B3717, B3718, or B3719 Circuit
Scheme 3
Wiper/Washer System Description and Operation
The windshield wiper/washer system consists of front and rear wipers. The front and rear wipers are operative when the vehicle is in accessory or run. The front wipers have 4 different modes. The 4 modes are MIST, Intermittent, Low, and High. When the front wipers are in the intermittent mode, there are 3 delay modes to chose from, commanded by the windshield wiper washer switch through the body control module (BCM). There is one mode for the rear wipers. The rear wipers has an intermittent mode only, and the intermittent mode has 3 delay modes to chose from. The wipers are powered through the windshield wiper washer switch except for the intermittent mode. The intermittent mode is controlled by the BCM. The front and rear wipers also have a washer function. By putting the wiper switch in the wash mode the front or rear wipers will spray washer fluid on the windshield and the wipers will then clean the windshield, wipers will be controlled by the BCM.
High Operation (Front Wipers Only)
In the High position, the windshield wiper washer switch supplies voltage to the high speed circuit of the windshield wiper motor. The windshield wiper motor will operate at high speed.
Intermittent Operation (Front and Rear Wipers)
The BCM controls the front and rear wipers, when the wipers are in the intermittent mode. When the BCM receives an input from the front or rear wipers switch, the BCM controls the input into the front or rear wiper relay. The BCM will energize the front or rear relay commanding the wipers On. There are 3 intermittent positions for the front or rear wipers. The intermittent switch (located in the wiper switch) sends inputs to the BCM indicating the speed the wipers should be in. Below is a table for the front and rear wipers indicating the time delay for each intermittent mode
| Front | Rear (with front wipers off) | Rear (with front wipers on) | ||
|---|---|---|---|---|
| Front (INT) | Front (LOW) | Front (HIGH) | ||
| 12 seconds | 17 seconds | 22 seconds | 17 seconds | 17 seconds |
| 7 seconds | 9 seconds | 13 seconds | 9 seconds | 9 seconds |
| 1 second | 2 seconds | 4 seconds | 2 seconds | 2 seconds |
Wiper/Washer System Description and Operation
Low Operation (Front Wipers Only)
In the Low position, the windshield wiper washer switch supplies voltage to the low/mist circuit of the windshield wiper motor. The windshield wiper motor will operate at low speed.
Mist Operation (Front Wipers Only)
In the MIST position, the windshield wiper washer switch supplies voltage to the low/mist circuit of the windshield wiper motor. The windshield wiper motor will operate at low speed.
The windshield wipers make one sweep at low speed and returns to the park position. If the windshield wiper washer switch is held in MIST mode, the windshield wipers will continue to operate until the switch is released.
Park Position Operation
The wiper and rear wiper fuses, supply voltage to signal circuit of the front and rear wiper motor, respectively. The signal will be pulled to voltage by the wiper motor while the windshield wiper motor is operating. When the windshield wiper motor has parked, the signal is at ground, (front wiper motor), or open, (rear wiper motor).
Wash Operation (Front and Rear Wipers)
The front and rear washer systems use the same windshield washer fluid pump. When either the front or rear wiper is in the washer position voltage will be supplied to one side of the windshield washer fluid pump (depending on whether it is front or rear), while the other side of the pump is grounded.
At this point, the windshield washer fluid pump sprays solvent onto the windshield. When the front or rear washer is activated, the BCM receives an input from the switch that is activated. The BCM will control the wipers while in the WASH mode. The BCM will control either the front wiper relay or the rear wiper relay to turn on the wipers. The windshield wipers operate at low speed for 3 swipes and returns to the park position.