Diagnostic Routine A
Diagnostic Routine A
Diagnostic Overview
The Wipers Are Inoperative - Windshield
Refer to Wiring Diagram Set 81 for schematic and connector information Electrical Diagrams.
Normal Operation and Fault Conditions
REFER to Windshield Wiper Operation . An internal failure in one or more of the windshield wiper system components or a disruption in the power, ground or communication circuits causes the windshield wipers to become inoperative.
Both the LH (Left Hand) windshield wiper motor and the battery current sensor communicate with the BCM (Body Control Module) over the same LIN (Local Interconnect Network). A short to ground or a short to voltage anywhere on the LIN (Local Interconnect Network), an open circuit on the LIN (Local Interconnect Network) before or at the splice, or an internal short in the wiper motor or current sensor will affect both the LH (Left Hand) windshield wiper motor and the battery current sensor. An open circuit on the LIN (Local Interconnect Network), after the splice, or an internal open in the wiper motor or current sensor will only affect the individual system.
DTC Fault Trigger Conditions
Visual Inspection and Diagnostic Pre-checks
Make sure BJB (Battery Junction Box) fuse 18 (20A) is OK.
Make sure BCM (Body Control Module) fuse 72 (7.5A) is OK.
Pinpoint Test
1. CHECK THE WIPER MOTOR OPERATION
1. Ignition ON.
2. Position the front wiper/washer switch in the LOW position and observe the front wipers.
Are both wiper motors inoperative?
2. CHECK FOR BCM (Body Control Module) DTCs (Diagnostic Trouble Codes)
1. Ignition ON.
2. Using a scan tool, carry out the BCM (Body Control Module) self-test.
Are any BCM (Body Control Module) DTCs (Diagnostic Trouble Codes) present?
3. RETRIEVE ALL CMDTCs (Continuous Memory Diagnostic Trouble Codes) IN ALL MODULES
1. Using a scan tool, retrieveALL CMDTCs (Continuous Memory Diagnostic Trouble Codes).
Is DTC (Diagnostic Trouble Code) B1317, B1318, B1676, U3003:16 and/or U3003:17 present in one or more modules AND are any charging system DTCs (Diagnostic Trouble Codes) present in the PCM (Powertrain Control Module)?
4. TEST THE BATTERY CONDITION
1. Ignition OFF.
2. Carry out the Battery Condition Test. REFER to Diagnostic Routine A: Battery Condition Test Pinpoint Tests.
Did the battery pass the condition test?
5. CHECK THE CHARGING SYSTEM VOLTAGE
NOTE: Do not allow the engine speed to exceed 2,000 RPM (Revolutions Per Minute) while performing this step or the generator may self-excite and result in default charging system output voltage. If engine speed exceeds 2,000 RPM (Revolutions Per Minute), turn the engine off and restart before performing this step.
1. Start the engine.
2. For DTC (Diagnostic Trouble Code) B1D38:17, turn off all accessories and increase engine speed to 1,500 RPM (Revolutions Per Minute) for a minimum of 2 minutes while measuring the battery voltage.
3. For DTC (Diagnostic Trouble Code) B1D38:16, turn on the headlights and the HVAC (Heating, Ventilation, and Air Conditioning) fan on high and increase engine speed to 1,500 RPM (Revolutions Per Minute) for a minimum of 2 minutes while measuring the battery voltage.
Is the voltage between 13 and 15.2 volts?
6. CHECK THE BCM (Body Control Module) WIPER/WASHER SWITCH PIDs (Parameter Identifications)
1. Using a scan tool, view the following BCM (Body Control Module) PIDs (Parameter Identifications):
- Wiper Stalk Illegal Combination (WPR_SW_ICOM)
- Wiper Stalk Stuck Position or Button (WPR_SW_STK)
2. While monitoring the PIDs (Parameter Identifications), place the wiper/washer switch into the windshield wiper LOW position.
Does either PID (Parameter Identification) display TRUE when the wiper/washer switch is in the LOW position?
7. CHECK THE LH (Left Hand) WINDSHIELD WIPER MOTOR GROUND CIRCUIT FOR AN OPEN
1. Ignition OFF.
2. Disconnect: LH (Left Hand) Windshield Wiper Motor.
3. Measure:
Is the resistance less than 3 ohms?
8. CHECK THE LH (Left Hand) WINDSHIELD WIPER MOTOR VOLTAGE CIRCUIT FOR AN OPEN
1. Measure:
Is the voltage greater than 11 volts?
9. ISOLATE THE BATTERY CURRENT SENSOR AND CHECK FOR RETURNING DTCs (Diagnostic Trouble Codes)
1. Ignition OFF.
2. Connect: LH (Left Hand) Windshield Wiper Motor (if previously disconnected).
3. Ignition ON.
4. Using a scan tool, clear the BCM (Body Control Module) DTCs (Diagnostic Trouble Codes).
5. Ignition OFF.
6. Disconnect: Battery Current Sensor.
7. Ignition ON.
8. Using a scan tool, carry out the BCM (Body Control Module) self-test.
Does DTC (Diagnostic Trouble Code) B1131:87 return?
10. CHECK THE LIN (Local Interconnect Network) CIRCUIT FOR AN OPEN
1. Ignition OFF.
2. Disconnect: LH (Left Hand) Windshield Wiper Motor.
3. Disconnect: BCM (Body Control Module) C2280A.
4. Measure:
5. Measure:
Are the resistances less than 3 ohms?
11. CHECK THE LIN (Local Interconnect Network) CIRCUIT FOR A SHORT TO GROUND
1. Measure:
Is the resistance greater than 10,000 ohms?
12. CHECK THE LIN (Local Interconnect Network) CIRCUIT FOR A SHORT TO VOLTAGE
1. Ignition ON.
2. Measure:
Is any voltage present?
13. CHECK FOR CORRECT WINDSHIELD WIPER MOTOR OPERATION
1. Ignition OFF.
2. Disconnect and inspect the LH (Left Hand) Windshield Wiper Motor connector (if not previously disconnected).
3. Repair:
- corrosion (install new connector or terminal - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary
4. Connect the LH (Left Hand) Windshield Wiper Motor connector. Make sure it seats and latches correctly.
5. Connect: BCM (Body Control Module) C2280A.
6. Connect: Battery Current Sensor (if previously disconnected).
7. Operate the system and determine if the concern is still present.
Is the concern still present?
14. CHECK THE RH (Right Hand) WINDSHIELD WIPER MOTOR GROUND CIRCUIT FOR AN OPEN
1. Ignition OFF.
2. Disconnect RH (Right Hand) Windshield Wiper Motor.
3. Measure:
Is the resistance less than 3 ohms?
15. CHECK THE RH (Right Hand) WINDSHIELD WIPER MOTOR VOLTAGE CIRCUIT FOR AN OPEN
1. Measure:
Is the voltage greater than 11 volts?
16. CHECK THE WIPER MOTOR COMMUNICATION CIRCUIT FOR AN OPEN
1. Disconnect LH (Left Hand) Windshield Wiper Motor.
2. Measure:
Is the resistance less than 3 ohms?
17. CHECK THE WIPER MOTOR COMMUNICATION CIRCUIT FOR A SHORT TO GROUND
1. Measure:
Is the resistance greater than 10,000 ohms?
18. CHECK THE WIPER MOTOR COMMUNICATION CIRCUIT FOR A SHORT TO VOLTAGE
1. Ignition ON.
2. Measure:
Is any voltage present?
19. CHECK FOR CORRECT RH (Right Hand) WINDSHIELD WIPER MOTOR OPERATION
1. Ignition OFF.
2. Inspect the RH (Right Hand) Windshield Wiper Motor.
3. Repair:
- corrosion (install new connector or terminal - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary
4. Connect the RH (Right Hand) Windshield Wiper Motor connector. Make sure it seats and latches correctly.
5. Connect the LH (Left Hand) Windshield Wiper Motor connector. Make sure it seats and latches correctly.
6. Operate the system and determine if the concern is still present.
Is the concern still present?
