Test Description
The numbers below refer to the step numbers on the diagnostic table.
- 2: This step verifies that the fault is current.
- 3: This step verifies the switch input to the BCM.
- 4: This step determines if the fault is in the headlamp washer switch. If the switch input to the BCM changes to an inactive state when disconnected the switch contacts are stuck or shorted to ground.
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Wiper/Washer Schematics Connector End View Reference: Wiper/Washer Connector End Views | |||
| 1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle |
| 2 | Install a scan tool. Turn ON the ignition, with the engine OFF. With a scan tool, observe the Headlamp Washer Switch parameter in the body control module (BCM) inputs data list. Does the scan tool display OFF? | Go to Step 3 | Go to Step 4 |
| 3 | Activate the headlamp washer switch. With the scan tool, observe the Headlamp Washer Switch parameter. Does the headlamp washer switch parameter change state? | Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 4 |
| 4 | Turn OFF the ignition. Disconnect the headlamp washer switch. Turn ON the ignition, with the engine OFF. With a scan tool, observe the Headlamp Washer Switch parameter. Does the scan tool display OFF? | Go to Step 7 | Go to Step 5 |
| 5 | Test the signal circuit of the headlamp washer switch for a short to ground. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 10 | Go to Step 6 |
| 6 | Inspect for poor connections at the harness connector of the BCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 10 | Go to Step 8 |
| 7 | Inspect for poor connections at the harness connector of the headlamp washer switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 10 | Go to Step 9 |
| 8 | Replace the BCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 10 | |
| 9 | Replace the headlamp washer switch. Did you complete the replacement? | Go to Step 10 | |
| 10 | Use the scan tool in order to clear the DTCs. Operate the system in order to verify the repair. Does the DTC reset? | Go to Step 2 | System OK |
DTC B2697
The numbers below refer to the step numbers on the diagnostic table.
- 5: This step tests for continuity through the 380 ohms resistor in the windshield wiper/washer switch.
- 6: This step tests for continuity through the delay resistors in the windshield wiper/washer switch. The measured resistance will change in sequence from low to high as the delay speed is increased.
| Step | Action | Values | Yes | No |
|---|---|---|---|---|
| Schematic Reference: Wiper/Washer Schematics Connector End View Reference: Wiper/Washer Connector End Views DEFINITION: Windshield wipers are inoperative in one or more modes. | ||||
| 1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle | |
| 2 | Turn ON the ignition. Attempt to operate the windshield wipers in all modes. Does the system operate normally? | Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 3 | |
| 3 | Do the windshield wipers operate in the high speed mode? | Go to Step 5 | Go to Step 4 | |
| 4 | Disconnect the steering column harness connector. Connect a fused jumper wire from the windshield wiper switch high signal circuit terminal in the body harness connector half to ground. Turn ON the ignition. Do the windshield wipers operate at high speed? | Go to Step 9 | Go to Step 8 | |
| 5 | Disconnect the windshield wiper motor connector. Test the resistance from the windshield wiper switch voltage supply circuit terminal to the windshield wiper switch signal 1 circuit terminal in the windshield wiper motor harness connector. Operate the windshield wiper/washer switch in the following positions: MIST LO Is the resistance near the specified value in the listed switch positions? | 380 ohms | Go to Step 6 | Go to Step 11 |
| 6 | Test the resistance from the windshield wiper switch voltage supply circuit terminal to the windshield wiper switch signal 1 circuit terminal in the windshield wiper motor harness connector. Operate the windshield wiper/washer switch in all of the delay positions. Does the resistance remain within the specified values from low to high as the delay speed is increased? | 1000-10K ohms | Go to Step 7 | Go to Step 13 |
| 7 | Test the windshield wiper switch signal 1 circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 17 | Go to Step 15 | |
| 8 | Test the windshield wiper switch high signal circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 17 | Go to Step 15 | |
| 9 | Test the wiper switch ground circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 17 | Go to Step 10 | |
| 10 | Test the windshield wiper switch high signal and ground circuits in the steering column harness for an open or high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 17 | Go to Step 13 | |
| 11 | Test the windshield wiper switch voltage supply circuit for an open or short to ground. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 17 | Go to Step 12 | |
| 12 | Test the windshield wiper switch signal 1 circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 17 | Go to Step 13 | |
| 13 | Inspect for poor connections at the windshield wiper/washer switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 17 | Go to Step 14 | |
| 14 | Replace the windshield wiper/washer switch. Refer to Turn Signal Multifunction Switch Replacement . Is the repair complete? | Go to Step 17 | ||
| 15 | Inspect for poor connections at the windshield wiper motor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 17 | Go to Step 16 | |
| 16 | Replace the windshield wiper motor. Refer to Wiper Transmission Replacement . Is the repair complete? | Go to Step 17 | ||
| 17 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 3 | |
Wipers Inoperative - One or More Modes
The numbers below refer to the step numbers on the diagnostic table.
- 3: If any of the listed switches fail, indicating an open liftglass or liftgate, the rear wiper/washer will not operate.
- 4: This step determines if the liftgate module (LGM) is receiving the correct switch position message from the body control module (BCM).
- 5: This step determines if the LGM is attempting to operate rear wiper motor in the requested operating mode.
- 6: 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 Connector End View Reference: Wiper/Washer Connector End Views DEFINITION: One or more of the rear wiper operating modes are inoperative. | ||||
| 1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle | |
| 2 | Turn ON the ignition. Operate the rear wiper switch through all the switch positions. Does the rear window wiper operate normally? | Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 3 | |
| 3 | Install a scan tool. Display the liftgate module (LGM) data list. Observe the following parameters while operating the respective switches. Refer to Scan Tool Data List for typical values. Liftgate ajar switch Liftglass ajar switch Did the scan tool indicate the correct switch positions? | Go to Step 4 | Go to Symptoms - Lighting Systems | |
| 4 | Observe the requested Rear Wiper parameter in LGM data list. Operate the rear wiper switch through all the switch positions. Does the scan tool indicate the correct requested Rear Wiper parameter in relation to the switch position? | Go to Step 5 | Go to Step 6 | |
| 5 | Close the liftglass and liftgate. Observe the Rear Wiper Mode/Rear Wiper parameter. Operate the rear wiper switch through all the switch positions. Does the scan tool indicate the correct Rear Wiper Mode parameter in relation to the switch position? | Go to Step 7 | Go to Step 18 | |
| 6 | Turn OFF the ignition. Disconnect the rear wiper switch. Measure the resistance through the rear wiper switch from the switch power circuit terminal to the signal circuit terminal. Operate the rear wiper switch through the following switch positions: OFF 1 2 3 Does the resistance remain within the specified values from OFF to 3 as the switch is operated through the listed switch positions? | 3,100-1,500 ohms | Go to Step 15 | Go to Step 11 |
| 7 | Turn OFF the ignition. Disconnect the rear wiper motor connector. Test the rear wiper motor battery voltage supply circuit for an open or short to ground. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 20 | Go to Step 8 | |
| 8 | Test the rear wiper motor ground circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 20 | Go to Step 9 | |
| 9 | Connect a test lamp between battery voltage circuit and the control circuit of the rear wiper motor connector. Close the liftglass and liftgate. Turn ON the ignition with the engine OFF. Turn the rear wiper switch from OFF to 3. Did the brightness of the test lamp decrease gradually as the rear wiper switch was turned from OFF to 3? | Go to Step 13 | Go to Step 10 | |
| 10 | Disconnect the LGM. Test the rear wiper motor control circuit for an open, a short to ground or a short to voltage. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 20 | Go to Step 18 | |
| 11 | Inspect for poor connections at the rear wiper switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 20 | Go to Step 12 | |
| 12 | Replace the rear wiper switch. Refer to Wiper/Washer Switch Replacement - Rear . Is the repair complete? | Go to Step 20 | ||
| 13 | Inspect for poor connections at the rear wiper motor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 20 | Go to Step 14 | |
| 14 | Replace the rear wiper motor. Refer to Wiper Motor Replacement - Rear . Is the repair complete? | Go to Step 20 | ||
| 15 | Test the rear window wiper switch signal circuit for an open or short to ground. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 20 | Go to Step 16 | |
| 16 | Inspect for poor connections at the body control module (BCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 20 | Go to Step 17 | |
| 17 | Replace the BCM. Refer to Control Module References for replacement, setup, and programming. Is the repair complete? | Go to Step 20 | ||
| 18 | Inspect for poor connections at the LGM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 20 | Go to Step 19 | |
| 19 | Replace the LGM. Refer to Control Module References for replacement, setup, and programming. Is the repair complete? | Go to Step 20 | ||
| 20 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 4 | |
Wiper Inoperative - Rear
Scheme 19
- Remove the wiper blades from the wiper arms. Refer to «Wiper Arm Blade Replacement»(ref-268104-S18750660512007101800000) .
- Look down the length of the blade element.
- Replace the wiper blade element if the rubber element which contacts the glass is not on the centerline of the blade +/-15 degrees. Refer to «Wiper Blade Element Replacement»(ref-268104-S27785423362007101800000) .
- Install the wiper blades on the wiper arms. Refer to «Wiper Arm Blade Replacement»(ref-268104-S18750660512007101800000) .
Headlamp Washer System Operation
The body control module controls the headlamp washer pump using a programmed pulse type wash sequence. The pulse washing sequence is a wash cycle for a programmed amount of time followed by a programmed amount of delay time to let the water soak which is then followed by another wash cycle for a programmed amount of time. The headlamp washer pump is controlled by the body control module through the headlamp washer relay. The headlamp washer switch signal circuit is supplied a 12-volt reference through a resistor then monitored within the body control module. The headlamp washer switch is open when in an inactive state. When the headlamp washer switch is activated the signal circuit is closed to ground. When the headlamp washer switch signal circuit is closed to ground the reference voltage is dropped across the resistor within the body control module. The low voltage on the headlamp washer switch signal circuit indicates to the body control module the switch status is active. Battery positive voltage is supplied to the coil and switch sides of the headlamp washer relay. When a headlamp wash request is active the body control module energizes the headlamp washer relay by grounding the relay coil through the headlamp washer relay control circuit. When the relay is energized battery positive voltage to the relay switch is supplied to the washer pump control circuit.
Windshield Wiper/Washer System Operation
Accessory voltage and ground is supplied to the windshield wiper motor and provides the power for operating the wiper motor and logic power to the wiper motor module. The WASH, MIST, LOW, and DELAY modes are controlled by the windshield wiper/washer switch through a series of internal resistors. The windshield wiper switch supply voltage circuit is a 12-volt reference from the wiper motor module to the wiper/washer switch, and the switch position determines the point on the resistor assembly where the reference voltage is applied. The windshield wiper switch signal 1 circuit supplies the voltage from the resistor assembly to the wiper motor module and the signal voltage determines the operating mode. High speed operation is controlled by the windshield wiper/washer switch through the windshield wiper switch high signal circuit. The windshield wiper switch high signal circuit is supplied 12 volts by the wiper motor module and when the wiper/washer switch is turned to the HIGH position the windshield wiper switch high signal circuit is grounded through the switch ground circuit. The windshield washer pump is controlled through the windshield wash relay. The windshield wash relay coil and switch is supplied battery positive voltage, and during WASH mode the wiper motor module grounds the washer relay control circuit energizing the relay. When the relay is energized battery positive voltage to the switch side of the relay is supplied to the washer pump control circuit.
Rear Washer Operation
The rear window washer pump is controlled by the body control module (BCM) through the rear washer relay. Battery positive voltage is supplied to the coil and switch sides of the rear washer relay. When the rear window wash request is active the BCM energizes the relay by grounding the relay coil through the rear washer relay control circuit. When the relay is energized battery positive voltage to the relay switch is supplied to the washer pump control circuit.
Rear Wiper Operation
The rear window wiper/washer switch is an input to the body control module (BCM). The requested rear wiper mode is sent to the liftgate control module (LGM) by the BCM, as a message on the serial data circuit. The rear window wiper motor is controlled by the LGM. The switch power circuit to the rear wiper/washer switch is a 12-volt reference supplied by the BCM during ignition on, accessory or RAP power modes. The rear wiper/washer switch is composed from a series of resistors and the switch position is determined by the voltage of the rear wiper/washer switch signal circuit to the BCM. The rear wiper/washer switch has continuity at all times and the BCM expects a rear wiper/washer switch signal voltage in all switch positions including OFF. The rear wiper motor is supplied battery positive voltage and ground. The LGM controls rear wiper motor operation through the rear window motor speed signal circuit. The rear window motor speed signal circuit is supplied a battery positive reference voltage by the rear window wiper motor module and is pulse width modulated to ground by the LGM. The duty cycle of the pulse width modulation determines the rear wiper motor operating mode. The liftglass and liftgate ajar switches are inputs to the LGM and must be in an inactive state in order for rear wiper washer system operation to be enabled. When an ajar switch is active the LGM suspends wiper motor operation directly and sends the ajar switch status messages over the serial data circuit enabling the BCM to suspend washer pump operation.