Fixed & Moveable Window System: Diagnosis Chevrolet Silverado 3500 HD

DIAGNOSTIC CODE INDEX

DIAGNOSTIC CODE INDEX

Diagnostic Starting Point - Fixed and Moveable Windows

Begin the system diagnosis with the Diagnostic System Check - Vehicle . The Diagnostic System Check will provide the following information

1. The identification of the control modules which command the system.
2. The ability of the control modules to communicate through the serial data circuit.
3. The identification of any stored diagnostic trouble codes (DTCs) and their status.

The use of the Diagnostic System Check will identify the correct procedure for diagnosing the system and where the procedure is located.

Diagnostic Instructions

1. Perform the «Diagnostic System Check - Vehicle»(ref-317170-S03444519162009060900000) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(ref-317170-S02898624092009060900000) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(ref-317170-S23773585642009060900000) provides an overview of each diagnostic category.

Diagnostic Fault Information

Conditions for Running the DTC

Battery voltage must be between 9-16 volts.

Circuit/System Testing

1. Ignition OFF, disconnect the REAR DEFOG relay.
2. Test for less than 1 ohm between the ground circuit terminal 85 and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
3. Connect a test lamp between the control circuit terminal 86 and ground.
4. Ignition ON, command the defogger grid ON and OFF by pressing and depressing the rear defogger switch. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the HVAC control module. If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the HVAC control module.
5. If all circuits test normal, test or replace the REAR DEFOG relay.

Component Testing

Relay Test

1. Ignition OFF, disconnect the REAR DEFOG relay.
2. Test for 60-180 ohms between terminals 85 and 86. If not within the specified range, replace the relay.
3. Test for infinite resistance between the following terminals: 30 and 86 30 and 87 30 and 85 85 and 87 If not the specified value, replace the relay.
4. Install a 30A fused jumper wire between relay terminal 85 and 12V. Install a jumper wire between relay terminal 86 and ground. Test for less than 2 ohms between terminals 30 and 87. If greater than the specified range, replace the relay.

1. Perform the «Diagnostic System Check - Vehicle»(ref-317170-S03444519162009060900000) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(ref-317170-S02898624092009060900000) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(ref-317170-S23773585642009060900000) provides an overview of each diagnostic category.

1. Battery voltage must be between 9-16 volts.
2. The ignition switch is in the ON position.

1. Ignition OFF, disconnect the harness connector at the appropriate front window motor.
2. Connect a test lamp between the control circuit terminal A and control circuit terminal B.
3. Ignition ON, command the window UP and DOWN by using the front door window switch. The test lamp should illuminate when commanding the UP and DOWN states. If the test lamp is always OFF during either of the commands, test either control circuit for a short to ground or an open/high resistance. If the circuits test normal, replace the door module. If the test lamp is always ON, test either control circuit for a short to voltage. If the circuits test normal, replace the door module.
4. If all circuits test normal, test or replace the front window motor.

1. Ignition OFF, disconnect the harness connector at the appropriate window motor.
2. Ignition ON, install a 25A fused jumper wire between the control terminal A and 12 volts. Momentarily install a jumper wire between the control terminal B and ground. The window motor should perform the UP function. If the function does not perform as specified, replace the window motor.
3. Reverse the jumper wires; the window motor should perform the DOWN function. If the function does not perform as specified, replace the window motor.

1. Perform the «Diagnostic System Check - Vehicle»(ref-317170-S03444519162009060900000) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(ref-317170-S02898624092009060900000) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(ref-317170-S23773585642009060900000) provides an overview of each diagnostic category.

Battery voltage is between 9-16 volts.

1. Ignition OFF, disconnect the harness connector at the appropriate rear window switch.
2. Ignition ON, test for greater than 9 volts between the signal circuit terminal A and ground while commanding the rear window UP by using the window switch on the driver master control. If less than the specified range, test the signal circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the BCM.
3. Test for greater than 9 volts between the signal circuit terminal C and ground while commanding the rear window DOWN by using the window switch on the driver master control. If less than the specified range, test the signal circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the BCM.
4. If all circuits test normal, replace the rear window switch.

1. Perform the «Diagnostic System Check - Vehicle»(ref-317170-S03444519162009060900000) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(ref-317170-S02898624092009060900000) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(ref-317170-S23773585642009060900000) provides an overview of each diagnostic category.

1. Battery voltage is between 9-16 volts.
2. The ignition is ON.

1. Ignition OFF, disconnect the harness connector at the appropriate rear window switch.
2. Ignition ON, enable the rear window switches by pressing the window lockout switch on the driver master control.
3. Test for greater than 9 volts between the control circuit terminal D and ground. If less than the specified range, test the control circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the BCM.
4. If all circuits test normal, replace the rear window switch.

Visual/Physical Inspection

1. Inspect for aftermarket devices which could affect the operation of the system. Refer to «Checking Aftermarket Accessories»(ref-317172-S31262273302009060900000) .
2. Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom

1. «Rear Window Defogger Malfunction»(ref-317154-S30955356192009060900000)
2. «Power Windows Malfunction (A31/AN3/DL3)»(ref-317154-S28576950062009060900000) or «Power Windows Malfunction (A31 without AN3, DL3)»(ref-317154-S09394543932009060900000)
3. «Power Rear Sliding Window Malfunction»(ref-317154-S23479223602009060900000)

1. Perform the «Diagnostic System Check - Vehicle»(ref-317170-S03444519162009060900000) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(ref-317170-S02898624092009060900000) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(ref-317170-S23773585642009060900000) provides an overview of each diagnostic category.

1. Ignition OFF, disconnect the REAR DEFOG relay.
2. Test for less than 1 ohm between the ground circuit terminal 85 and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal 87 and ground. If the test lamp illuminates, test the control circuit for a short to voltage.
4. Verify that a test lamp illuminates between the B+ circuit terminal 30 and ground. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
5. Ignition OFF, disconnect the X2 harness connector at the defogger grid.
6. Test for less than 5 ohms between the defogger grid ground circuit terminal A and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
7. Connect the harness connector at the defogger grid.
8. Ignition ON, connect a 30A fused jumper wire between the B+ circuit terminal 30 and the control circuit terminal 87. Verify the defogger grid is activated. If the defogger grid does not activate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the defogger grid.
9. Connect a test lamp between the control circuit terminal 86 and ground.
10. Command the defogger grid ON and OFF by pressing and depressing the rear defogger switch. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the HVAC control module. If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the HVAC control module.
11. If all circuits test normal, test or replace the REAR DEFOG relay.

Relay Test

1. Ignition OFF, disconnect the rear defog relay.
2. Test for 60-180 ohms between terminals 85 and 86. If not within the specified range, replace the relay.
3. Test for infinite resistance between the following terminals: 30 and 86 30 and 87 30 and 85 85 and 87 If not the specified value, replace the relay.
4. Install a 30-amp fused jumper wire between relay terminal 85 and 12 volts. Install a jumper wire between relay terminal 86 and ground. Test for less than 2 ohms between terminals 30 and 87. If greater than the specified range, replace the relay.

Rear Window Defogger Grid Test

1. Ignition ON, turn on the rear window defogger.
2. Verify that a test lamp illuminates between each rear window defogger grid line and ground. The test lamp should be off when testing at the ground side of the grid and get brighter as the test lamp moves closer to the voltage supply side of the grid. The test lamp should be dim when testing each grid line in the middle. If the test lamp remains bright at the middle of the grid line, test for an open between the test point and the ground side of the grid. If the test lamp remains off at the middle of the grid line, test for an open between the test point and the voltage supply side of the grid.

1. Perform the «Diagnostic System Check - Vehicle»(ref-317170-S03444519162009060900000) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(ref-317170-S02898624092009060900000) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(ref-317170-S23773585642009060900000) provides an overview of each diagnostic category.

1. Ignition OFF, disconnect the harness connector at the sliding rear window switch.
2. Ignition ON, verify the test lamp illuminates between the accessory voltage circuit terminal A and ground. If the test lamp does not illuminate, test the accessory voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal replace the BCM.
3. Ignition OFF, connect the sliding rear window switch and disconnect the sliding rear window open and sliding rear window close relays.
4. Test for less than 1 ohm between the ground circuit terminal B2 and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
5. Test for less than 1 ohm between the ground circuit terminal A1 and ground. If greater than the specified range, test the ground circuit for an open/high resistance.
6. Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal C1 and ground. If the test lamp illuminates, test the control circuit for a short to voltage.
7. Verify that a test lamp illuminates between the B+ circuit terminal A2 and ground. If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
8. Connect a test lamp between the control circuit terminal C2 and the ground circuit terminal A1.
9. Command the power sliding window to OPEN and CLOSE by using the sliding rear window switch. The test lamp should turn ON and OFF when changing between the commanded states. If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the sliding rear window switch. If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, test or replace the sliding rear window switch.
10. Ignition OFF, connect the sliding rear window open and sliding rear window close relays.
11. Disconnect the harness connector at the sliding rear window motor.
12. Test for less than 5 ohms between the control circuit terminal A and ground. If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuits test normal, replace the sliding rear window close relay.
13. Test for less than 5 ohms between the control circuit terminal B and ground. If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuits test normal, replace the sliding rear window open relay
14. Connect a test lamp between the control circuit terminal A and ground.
15. Ignition ON, command the sliding rear window to CLOSE by using the sliding rear window switch. The test lamp should turn ON when commanding CLOSE state. If the test lamp is always OFF, test the control circuit for a short to ground. If the circuit tests normal, test or replace the sliding rear window close relay.
16. Connect a test lamp between the control circuit terminal B and ground.
17. Command the sliding rear window to OPEN by using the sliding rear window switch. The test lamp should turn ON when commanding OPEN state. If the test lamp is always OFF, test the control circuit for a short to ground. If the circuit tests normal, test or replace the sliding rear window open relay.
18. If all circuits test normal, test or replace the sliding rear window motor.

1. Ignition OFF, disconnect the appropriate relay.
2. Test for 60-200 ohms between terminals 85 and 86. If not within the specified range, replace the relay.
3. Test for infinite resistance between the following terminals: 30 and 86 30 and 87 30 and 85 85 and 87 If not the specified value, replace the relay.
4. Test for less than 2 ohms between terminals 30 and 87A. If greater than the specified range, replace the relay.
5. Install a 3-amp fused jumper wire between relay terminal 85 and 12 volts. Install a jumper wire between relay terminal 86 and ground. Test for less than 2 ohms of resistance between terminals 30 and 87. If greater than the specified range, replace the relay.

1. Perform the «Diagnostic System Check - Vehicle»(ref-317170-S03444519162009060900000) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(ref-317170-S02898624092009060900000) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(ref-317170-S23773585642009060900000) provides an overview of each diagnostic category.

1. Ignition OFF, disconnect the harness connector at the appropriate window motor.
2. Install a 25A fused jumper wire between one of the control terminals and 12V. Momentarily install a jumper wire between the other control terminal and ground. Reverse the jumper wires at least two times, the window motor should perform the UP/DOWN functions. If it does not perform as specified, replace the window motor.

1. Perform the «Diagnostic System Check - Vehicle»(ref-317170-S03444519162009060900000) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(ref-317170-S02898624092009060900000) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(ref-317170-S23773585642009060900000) provides an overview of each diagnostic category.

1. Ignition OFF, disconnect the harness connector at the appropriate window motor.
2. Install a 30A fused jumper wire between one of the control terminals and 12V. Momentarily install a jumper wire between the other control terminal and ground. Reverse the jumper wires at least two times, the window motor should perform the UP/DOWN functions. If it does not perform as specified, replace the window motor.