Fixed and Moveable Window System Cadillac ATS I

Fastener Tightening Specifications

Fastener Tightening Specifications

Scheme 1

Scheme 2

Scheme 3

Scheme 4

Diagnostic Code Index

DIAGNOSTIC CODE INDEX

Diagnostic Instructions

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

Diagnostic Fault Information

Circuit/System Description

When the HVAC Control Module receives a rear window defog request from the HVAC face plate, the HVAC Control Module control the coil side of the Rear Defogger Relay. This will energize the relay causing the contacts within the relay to close and provide B+ voltage to the rear window defogger grid.

Conditions for Running the DTC

When the relay is being actively commanded by the HVAC Control Module

Conditions for Setting the DTC

B0283 02

The HVAC Control Module detects a short to ground in the relay coil control circuit.

B0283 05

The HVAC Control Module detects a short to voltage or an open/high resistance in the relay coil control circuit or an open/high resistance in the relay coil ground circuit

Action Taken When the DTC Sets

B0283 02

The rear window defogger will be inoperative.

B0283 05

The rear window defogger will be inoperative or continuously active depending upon the fault.

Conditions for Clearing the DTC

1. The DTC will be current for as long as the fault is present.
2. When the fault is no longer present, the DTC will be a history DTC.
3. A history DTC will clear after 50 ignition cycles.

Reference Information

Schematic Reference

Defogger Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Rear Window Defogger Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Engine Running.
2. Verify the E18 Rear Defogger Grid turns ON and OFF when commanding the Rear Defogger On and Off with a scan tool. If the E18 Rear Defogger Grid does not turn ON or OFF Refer to Circuit/System Testing If the E18 Rear Defogger Grid turns ON and OFF
3. All OK.

Circuit/System Testing

1. Ignition OFF and all vehicle systems OFF, disconnect the KR5 Rear Defogger Relay. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 10 ohms between the ground circuit terminal 85 and ground. If 10 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 10 ohms
3. Connect a test lamp between the control circuit terminal 86 and the ground circuit terminal 85, Engine Running.
4. Verify the test lamp turns ON and OFF when commanding the Rear Defogger On and Off with a scan tool. If the test lamp is always OFF Ignition OFF, remove the test lamp. disconnect the harness connector at the K33 HVAC Control Module. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K33 HVAC Control Module. If the test lamp is always ON Ignition OFF, remove the test lamp, disconnect the harness connector at the K33 HVAC Control Module, Engine Running. Test for less than 1 V between the control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K33 HVAC Control Module. If the test lamp turns ON and OFF
5. Test or replace the KR5 Rear Defogger Relay.

Component Testing

Relay Test

1. Ignition OFF, disconnect the KR5 Rear Defogger Relay.
2. Test for 60-180 ohms between terminals 86 and 85. If less than 60 ohms or greater than 180 ohms Replace the KR5 Rear Defogger Relay. If between 60-180 ohms
3. Test for infinite resistance between the terminals listed below: 86 and 30 86 and 87 85 and 30 85 and 87 If less than infinite resistance Replace the KR5 Rear Defogger Relay. If infinite resistance
4. Install a 3 A fused jumper wire between relay terminal 86 and 12 V. Install a jumper wire between relay terminal 85 and ground.
5. Test for less than 2 ohms between terminals 30 and 87. If 2 ohms or greater Replace the KR5 Rear Defogger Relay. If less than 2 ohms
6. All OK

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

1. «Relay Replacement (Within an Electrical Center)»(/cadillac/ats/i-2012-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions__relay-replacement-within-an-electrical-center) , «Relay Replacement (Attached to Wire Harness)»(/cadillac/ats/i-2012-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions)
2. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for HVAC Control Module replacement, programming and setup

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

DTC Descriptors

For symptom byte information refer to: Symptom Byte List

The driver and passenger window motors supply 12V signal circuits to their respective window switches, when a window switch has been activated, a switch closes providing a ground to the appropriate signal circuit causing the voltage to drop to 0V. The window motor will detect the voltage drop in the signal circuit and will command the window to move in the desired direction.

The driver window master control switch also contains control switches for the passenger, left rear and right rear window functions. When a window switch is pressed, a serial data message is sent to the body control module (BCM). The BCM examines the request and checks for messages from other power window motors that may prohibit window movement. If no prohibitive messages have been received, the BCM will send a serial data message to the passenger window motor or to the appropriate rear window switch which will perform the command as requested.

Battery voltage must be between 9-16 V.

B316B 00

The BCM has detected a control switch on the driver window master switch has been active for greater than 60 seconds.

B316B 02

The driver window motor has detected the driver window master switch is active for greater than 60 seconds.

B317A 02

The passenger window motor has detected the passenger window switch is active for greater than 60 seconds.

B318A 02

The BCM has detected the left rear window switch is active for greater than 60 seconds

B319A 02

The BCM has detected the right rear window switch is active for greater than 60 seconds

B316B 39

The driver window motor has detected an internal failure within the driver window switch

B317A 39

The passenger window motor has detected an internal failure within the passenger window switch

B318A 39

The BCM has detected an internal failure within the left rear window switch

B319A 39

The BCM has detected an internal failure within the right rear window switch

The affected power window will malfunction.

B316B 00, B316B 02, B317A 02, B318A 02, B319A 02

1. The DTC will be current for as long as the fault is present.
2. The DTC will change from current to history when the fault is no longer present.
3. A history DTC will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present.

B316B 39, B317A 39, B318A 39, B319A 39

If the DTC is current, the affected window switch must be replaced before the DTC can be cleared.

Schematic Reference

Moveable Window Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Power Windows Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON.
2. Verify the scan tool parameters listed below change when pressing and pulling the switches for the passenger, left rear and right rear window on the driver window master control; Left Rear Main Control Down Switch - Inactive and Active Left Rear Main Control Express Switch - Inactive and Active Left Rear Main Control Up Switch - Inactive and Active Right Rear Main Control Down Switch - Inactive and Active Right Rear Main Control Express Switch - Inactive and Active Right Rear Main Control Up Switch - Inactive and Active Front Passenger Main Control Down Switch - Inactive and Active Front Passenger Main Control Express Switch - Inactive and Active Front Passenger Main Control Up Switch - Inactive and Active If any parameter does not change Replace the S79D Window Switch-Driver. If the parameters change
3. Verify the scan tool parameters listed below change when pressing and pulling the driver window control switch on the driver window master control: Driver Window Main Control Down Switch - Inactive and Active Driver Window Main Control Up Switch - Inactive and Active Driver Window Main Control Express Switch - Inactive and Active If any parameter does not change Refer to Circuit/System Testing - Driver Window Switch Malfunction. If all the parameters change
4. Verify the scan tool Passenger Window Switch at Door parameters change to Inactive, Up, Express Up, Down, Express Down when pressing and pulling the S79P Window Switch-Passenger. If any parameter does not change Refer to Circuit/System Testing - Passenger Window Switch Malfunction. If all the parameters change
5. Verify the scan tool parameters listed below change when pressing and pulling the S79LR Window Switch-Left Rear and the S79RR Window Switch-Right Rear. Left Rear Window Switch at Door - Inactive, Up, Express Up, Down, Express Down Right Rear Window Switch at Door - Inactive, Up, Express Up, Down, Express Down If any parameter does not change Test or replace the appropriate S79 Window Switch-Rear. If all the parameters change
6. All OK.

Driver Window Switch Malfunction

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S79D Window Switch-Driver. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 10 ohms between the ground circuit terminal 1 and ground. If 10 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 10 ohms
3. Ignition ON.
4. Verify a test lamp illuminates between the B+ circuit terminal 4 and ground. If the test lamp does not illuminate and the circuit fuse is good Ignition OFF. Test for less than 2 ohms in the B+ circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse. If the test lamp does not illuminate and the circuit fuse is open Ignition OFF. Test for infinite resistance between the B+ circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the S79D Window Switch-Driver. If the test lamp illuminates
5. Verify the scan tool Driver Window Main Control Down Switch parameter is Inactive. If not Inactive Ignition OFF, disconnect the harness connector at the M74D Window Motor-Driver. Test for infinite resistance between the S79D Window Switch-Driver signal circuit terminal 3 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the M74D Window Motor-Driver. If Inactive
6. Install a 3 A fused jumper wire between the signal circuit terminal 3 and the ground circuit terminal 1.
7. Verify the scan tool Driver Window Main Control Down Switch parameter is Active If not Active Ignition OFF, remove the 3 A fused jumper wire, disconnect the harness connector at the M74D Window Motor-Driver, ignition ON. Test for less than 1 V between the S79D Window Switch-Driver signal circuit terminal 3 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the M74D Window Motor-Driver. If Active
8. Verify the scan tool Driver Window Main Control Up Switch parameter is Inactive. If not Inactive Ignition OFF, disconnect the harness connector at the M74D Window Motor-Driver. Test for infinite resistance between the S79D Window Switch-Driver signal circuit terminal 6 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the M74D Window Motor-Driver. If Inactive
9. Install a 3 A fused jumper wire between the signal circuit terminal 6 and the ground circuit terminal 1.
10. Verify the scan tool Driver Window Main Control Up Switch parameter is Active If not Active Ignition OFF, remove the 3 A fused jumper wire, disconnect the harness connector at the M74D Window Motor-Driver, ignition ON. Test for less than 1 V between the S79D Window Switch-Driver signal circuit 6 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the M74D Window Motor-Driver. If Active
11. Verify the scan tool Driver Window Main Control Express Switch parameter is Inactive. If not Inactive Ignition OFF, disconnect the harness connector at the M74D Window Motor-Driver. Test for infinite resistance between the S79D Window Switch-Driver signal circuit terminal 2 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the M74D Window Motor-Driver. If Inactive
12. Install a 3 A fused jumper wire between the signal circuit terminal 2 and the ground circuit terminal 1.
13. Verify the scan tool Driver Window Main Control Express Switch parameter is Active If not Active Ignition OFF, remove the 3 A fused jumper wire, disconnect the harness connector at the M74D Window Motor-Driver, ignition ON. Test for less than 1 V between the S79D Window Switch-Driver signal circuit 2 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the M74D Window Motor-Driver. If Active
14. Test or replace the S79D Window Switch-Driver.

Passenger Window Switch Malfunction

1. Ignition OFF, and all vehicle systems OFF, disconnect the harness connector at the S79P Window Switch-Passenger. It may take up to 2 minutes for all vehicle systems to power down
2. Test for less than 10 ohms between the ground circuit terminal 1 and ground. If 10 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 10 ohms
3. Ignition ON.
4. Verify the scan tool Passenger Window Switch at Door parameter is Inactive. If not Inactive Ignition OFF, disconnect the harness connector at the M74P Window Motor-Passenger Test for infinite resistance between the signal circuit terminal listed below and ground: S79P Window Switch-Passenger - signal circuit terminal 7 S79P Window Switch-Passenger - signal circuit terminal 8 If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the M74P Window Motor-Passenger. If Inactive
5. Install a 3 A fused jumper wire between the signal circuit terminal 8 and ground
6. Verify the scan tool Passenger Window Switch at Door parameter is Up If not Up Ignition OFF, remove the fused jumper wire, disconnect the harness connector at the M74P Window Motor-Passenger, ignition ON. Test for less than 1 V between the S79P Window Switch-Passenger signal circuit terminal 8 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Ignition OFF, test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the M74P Window Motor-Passenger. If Up
7. Install a 3 A fused jumper wire between the signal circuit terminal 7 and ground.
8. Verify the scan tool Passenger Window Switch at Door parameter is Down If not Down Ignition OFF, remove the fused jumper wire, disconnect the harness connector at the M74P Window Motor-Passenger, ignition ON. Test for less than 1 V between the S79P Window Switch-Passenger signal circuit terminal 7 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Ignition OFF, test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the M74P Window Motor-Passenger. If Down
9. Test for greater than 10 V between the signal circuit terminal 6 and ground If less than 10 V Ignition OFF, disconnect the harness connector at the M74P Window Motor-Passenger. Test for infinite resistance between the S79P Window Switch-Passenger signal circuit 6 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance on the circuit. If less than 2 ohms, replace the M74P Window Motor-Passenger. If greater than 10 V
10. Test or replace the S79P Window Switch-Passenger.

Perform the Diagnostic Repair Verification after completing the repair.

1. «Front Side Door Window Switch Replacement - Right Side»(/cadillac/ats/i-2012-2014/remont/heated-glassdefoggers/#fixed-and-moveable-window-system)
2. «Front Side Door Window Switch Replacement - Left Side»(/cadillac/ats/i-2012-2014/remont/heated-glassdefoggers/#fixed-and-moveable-window-system)
3. «Rear Side Door Window Switch Replacement»(/cadillac/ats/i-2012-2014/remont/heated-glassdefoggers/#fixed-and-moveable-window-system)
4. «Front Side Door Window Regulator Motor Replacement»(/cadillac/ats/i-2012-2014/remont/heated-glassdefoggers/#fixed-and-moveable-window-system)

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

For symptom byte information, refer to Symptom Byte List .

The body control module (BCM) monitors, receives and transmits serial data messages to the driver and passenger window motors. When a window switch has been activated on the driver window switch, a signal is sent to the BCM which sends a signal to the appropriate window motor and the window motor will move in the direction commanded.

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

B3205 00, B3210 00

The BCM has detected that the compatibility code stored in the affected window motor does not match the compatibility code stored in the BCM.

B3205 39, B3210 39

An internal malfunction has been detected by the BCM in the power window motor while commanding the window UP or DOWN.

B3205 42, B3210 42

The BCM will automatically attempt to download the calibration program into the appropriate window motor (As will occur when the window motor has been replaced), if the first calibration program fails to load, the BCM will attempt to download the calibration program a second time. If this download fails, the BCM will set appropriate DTC.

B3205 4B, B3210 4B

The BCM detects that a window motor is "not normalized" which will occur under the following conditions

1. When the battery has been disconnected
2. When the battery has been replaced
3. When the door wiring harness has been disconnected
4. When the window motor has been disconnected.

B3205 00, B3205 39, B3205 42, B3210 00, B3210 39, B3210 42

The affected motor will be inoperative.

B3205 4B, B3210 4B

The affected motor will not perform the express up or express down functions and the driver information center will display Open, then Close Driver Window or will display Open, then Close Passenger Window.

B3205 00, B3210 00

Installing a compatible window motor for that specific make and model vehicle.

B3205 39, B3210 39

The appropriate window motor must be replaced before the DTC can be cleared.

B3205 42, B3210 42

The appropriate window motor must be replaced before the DTC can be cleared.

B3205 4B, B3210 4B

The appropriate window motor must be normalized before the DTC can be cleared.

Schematic Reference

Moveable Window Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Power Windows Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON.
2. Verify the driver and passenger functions while commanding the Driver Window Motor or Passenger Window Motor Up and Down with a scan tool. If the Up and Down does not work Replace the appropriate M74 Window Motor. If the Up and Down works
3. Verify the driver and passenger window performs the Express Up and Express Down functions with the driver window switch. If a window does not Express Up and Express Down Normalize the window motor, refer to «Window Motor Programming - Express Function»(/cadillac/ats/i-2012-2014/remont/heated-glassdefoggers/#fixed-and-moveable-window-system) . If the window performs the Express Up and Express Down functions
4. All OK.

Perform the Diagnostic Repair Verification after completing the repair

Front Side Door Window Regulator Motor Replacement

Symptoms - Fixed and Moveable Windows

Important Preliminary Checks Before Starting

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) before using the symptom tables in order to verify that all of the following are true: There are no DTCs set. The control modules can communicate via the serial data link.
2. Review the power window system operation or rear window defogger system operation in order to familiarize yourself with the system functions. Refer to the following: «Rear Window Defogger Description and Operation»(/cadillac/ats/i-2012-2014/remont/heated-glassdefoggers/#fixed-and-moveable-window-system) «Power Windows Description and Operation»(/cadillac/ats/i-2012-2014/remont/heated-glassdefoggers/#fixed-and-moveable-window-system)

Visual/Physical Inspection

1. Inspect for aftermarket devices which could affect the operation of the rear window defogger. Refer to «Checking Aftermarket Accessories»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__checking-aftermarket-accessories) .
2. Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

Intermittent

Note. Inspect for proper installation of electrical components if an intermittent condition exists. Inspect for aftermarket theft deterrent devices, lights, and cellular phones. Ensure that no aftermarket equipment is connected to the class 2 circuit. If you can not locate an intermittent condition, a cellular phone signal may cause the condition. Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections . The problem may or may not turn ON the SERVICE VEHICLE SOON indicator or store a DTC. Do not use the symptom tables to diagnose intermittent conditions. The malfunction must be present in order to locate the problem.

Poor electrical connections or wiring cause most intermittent conditions. Perform a careful visual/physical check for the following conditions

1. Poor mating of the connector halves or a terminal not fully seated in the connector body
2. An improperly formed or damaged terminal
3. Reform or replace connector terminals in the problem circuit in order to ensure proper contact tension.
4. Poor terminal to wire connection requires removing the terminal from the connector body in order to perform the check.

Use a scan tool in order to help detect intermittent conditions. The scan tool has several features that can be used to locate an intermittent condition. The snapshot feature can capture and store data parameters within the scan tool when the malfunction occurs. This information can then be reviewed in order to see what caused the malfunction.

Symptom List

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

1. «Rear Window Defogger Malfunction»(/cadillac/ats/i-2012-2014/remont/heated-glassdefoggers/#fixed-and-moveable-window-system)
2. «Power Windows Malfunction»(/cadillac/ats/i-2012-2014/remont/heated-glassdefoggers/#fixed-and-moveable-window-system)

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

When the HVAC control module receives a rear window defog request from the radio/HVAC controls, the HVAC control module will supply 12 V to the coil side of the rear defogger relay. This will energize the relay causing the contacts within the relay to close and provide B+ voltage to the rear window defogger grid.

Schematic Reference

Defogger Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Rear Window Defogger Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Engine running.
2. Verify the scan tool Rear Defogger Switch parameter changes between On and Off when pressing the rear window defogger switch. If the parameter does not change between On and Off Replace the A20 Radio/HVAC Controls. If the parameter changes between On and Off
3. Verify the rear window defog indicator turns ON and OFF when commanding the Illuminate All Indicators On and Off with a scan tool. If the rear window defog indicator does not turn ON and OFF Replace the A20 Radio/HVAC Controls. If the rear window defog indicator turns ON and OFF
4. Verify the E18 Rear Defogger Grid turns ON and OFF when commanding the Rear Defogger On and Off with a scan tool. If the E18 Rear Defogger Grid does not turn ON and OFF Refer to Circuit/System Testing If the E18 Rear Defogger Grid turns ON and OFF
5. All OK.

1. Ignition OFF and all vehicle systems OFF, disconnect the KR5 Rear Defogger Relay. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 10 ohms between the ground circuit terminal 85 and ground. If 10 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 10 ohms
3. Ignition ON.
4. Verify a test lamp illuminates between the B+ circuit terminal 30 and ground. If the test lamp does not illuminate Replace the X53A Fuse Block-Rear Body If the test lamp illuminates
5. Connect a test lamp between the control circuit terminal 86 and the ground circuit terminal 85.
6. Verify the test lamp turns ON and OFF when commanding the Rear Defogger On and Off with a scan tool. If the test lamp is always OFF Ignition OFF, remove the test lamp, disconnect the harness connector at the K33 HVAC Control Module. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the K33 HVAC Control Module. If the test lamp is always ON Ignition OFF, remove the test lamp, disconnect the harness connector at the K33 HVAC Control Module, ignition ON. Test for less than 1 V between the control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K33 HVAC Control Module. If the test lamp turns ON and OFF
7. Verify that a test lamp does not illuminate between the control circuit terminal 87 and ground. If the test lamp illuminates Repair the short to voltage on the control circuit If the test lamp does not illuminate
8. Ignition OFF and all vehicle systems OFF, disconnect the X2 harness connector at the E18 Rear Defogger Grid. It may take up to 2 minutes for all vehicle systems to power down.
9. Test for less than 10 ohms between the ground circuit terminal 1 and ground. If 10 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 10 ohms
10. Connect the X2 harness connector at the E18 Rear Defogger Grid.
11. Ignition ON, connect a 40 A fused jumper wire between the B+ circuit terminal 30 and the control circuit terminal 87.
12. Verify the E18 Rear Defogger Grid is activated. If the E18 Rear Defogger Grid does not activate Ignition OFF, remove the jumper wire, disconnect the X1 harness connector at the E18 Rear Defogger Grid. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the E18 Rear Defogger Grid. If the E18 Rear Defogger Grid activates
13. Test or replace the KR5 Rear Defogger Relay.

Relay Test

1. Ignition OFF, disconnect the KR5 Rear Defogger Relay.
2. Test for 60-180 ohms between terminals 86 and 85. If less than 60 ohms or greater than 180 ohms Replace the KR5 Rear Defogger Relay. If between 60-180 ohms
3. Test for infinite resistance between the terminals listed below: 86 and 30 86 and 87 85 and 30 85 and 87 If less than infinite resistance Replace the KR5 Rear Defogger Relay. If infinite resistance
4. Install a 3 A fused jumper wire between relay terminal 86 and 12 V. Install a jumper wire between relay terminal 85 and ground.
5. Test for less than 2 ohms between terminals 30 and 87. If 2 ohms or greater Replace the KR5 Rear Defogger Relay. If less than 2 ohms
6. All OK

Rear Defogger Grid Test

1. Engine running, command the Rear Defogger ON with a scan tool.
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. The grid line is open between the test point and the ground side of the grid. Replace the rear window If the test lamp remains off at the middle of the grid line. The grid line is open between the test point and the voltage supply side of the grid. Replace the rear window If the test lamp remains dim at the middle of each grid line.
3. All OK

Perform the Diagnostic Repair Verification after completing the repair.

1. «Rear Window Replacement»(/cadillac/ats/i-2012-2014/remont/heated-glassdefoggers/#fixed-and-moveable-window-system__rear-window-replacement)
2. «Relay Replacement (Within an Electrical Center)»(/cadillac/ats/i-2012-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions__relay-replacement-within-an-electrical-center) , «Relay Replacement (Attached to Wire Harness)»(/cadillac/ats/i-2012-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions)
3. «Rear Body Fuse Block Replacement»(/cadillac/ats/i-2012-2014/remont/ignition-switchsteering-lock/#wiring-systems-and-power-management-repair-instructions)
4. «Control Module References»(/cadillac/ats/i-2012-2014/remont/communication-devices/#programming-and-setup-all-systems__control-module-references) for HVAC control module or radio/HVAC controls replacement, programming and setup

1. Perform the «Diagnostic System Check - Vehicle»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures) prior to using this diagnostic procedure.
2. Review «Strategy Based Diagnosis»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__strategy-based-diagnosis) for an overview of the diagnostic approach.
3. «Diagnostic Procedure Instructions»(/cadillac/ats/i-2012-2014/remont/oem-general-information/#vehicle-diagnostic-information-diagnostic-information-and-procedures__diagnostic-procedure-instructions) provides an overview of each diagnostic category.

The driver and passenger window motors supply 12 V signal circuits to their respective window switches, when a window switch has been activated, a switch closes providing a ground to the appropriate signal circuit causing the voltage to drop to 0 V. The window motor will detect the voltage drop in the signal circuit and will command the window to move in the desired direction.

The driver window master control switch also contains control switches for the passenger, left rear and right rear window functions. When a window switch is pressed, a serial data message is sent to the body control module (BCM). The BCM examines the request and checks for messages from other power window motors that may prohibit window movement. If no prohibitive messages have been received, the BCM will send a serial data message to the passenger window motor or to the appropriate rear window switch which will perform the command as requested.

Diagnostic Aids

The loss of the express up and express down functions for the driver or passenger window may have occurred for the following reasons

1. The battery was disconnected
2. The battery was replaced
3. A door wiring harness was disconnected
4. A window motor was disconnected

The window motor will need to be normalized in order to restore the express functions, refer to Window Motor Programming - Express Function for the proper procedure

Schematic Reference

Moveable Window Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEWS - INDEX

Description and Operation

Power Windows Description and Operation

Electrical Information Reference

1. «Circuit Testing»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__circuit-testing)
2. «Connector Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__connector-repairs)
3. «Testing for Intermittent Conditions and Poor Connections»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__testing-for-intermittent-conditions-and-poor)
4. «Wiring Repairs»(/cadillac/ats/i-2012-2014/remont/body-electrical/#wiring-systems-and-power-management-diagnostic-information-and-procedures__wiring-repairs)

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON.
2. Verify the driver window functions while commanding the Driver Window Motor Up and Down with a scan tool. If the driver window does not move UP and DOWN as commanded Refer to Circuit/System Testing - Driver/Passenger Window Motor Malfunction. If the driver window moves UP and DOWN as commanded
3. Verify the driver window moves while commanding the window UP, express UP, DOWN and express DOWN with the S79D Window Switch-Driver. If the driver window does not move UP or DOWN as commanded Refer to Circuit/System Testing - Driver Window Switch Malfunction. If the driver window does not express UP or express DOWN Normalize the driver window motor, refer to «Window Motor Programming - Express Function»(/cadillac/ats/i-2012-2014/remont/heated-glassdefoggers/#fixed-and-moveable-window-system) . If after normalization, the driver window does not express UP or express DOWN Refer to Circuit/System Testing - Driver Window Switch Malfunction. If the driver window moves UP, express UP, DOWN and express DOWN as commanded
4. Verify the scan tool parameters listed below change when pressing and pulling the switches for the passenger, left rear and right rear window on the driver window master control; Left Rear Main Control Down Switch - Inactive and Active Left Rear Main Control Express Switch - Inactive and Active Left Rear Main Control Up Switch - Inactive and Active Right Rear Main Control Down Switch - Inactive and Active Right Rear Main Control Express Switch - Inactive and Active Right Rear Main Control Up Switch - Inactive and Active Front Passenger Main Control Down Switch - Inactive and Active Front Passenger Main Control Express Switch - Inactive and Active Front Passenger Main Control Up Switch - Inactive and Active If the parameters do not change Refer to Circuit/System Testing - Driver Window Switch Malfunction. If the parameters changes
5. Verify the scan tool Child Security Lockout Switch parameter changes between Inactive and Active when pressing the window lockout switch on the S79D Window Switch-Driver. If the parameters do not change Refer to «Power Door Child Lock Malfunction»(/cadillac/ats/i-2012-2014/remont/door-locks-anti-theft-systems/#power-door-lock-system-and-release-systems) If the parameters changes
6. Verify the lockout indicator turns ON and OFF when commanding the Child Security Lock Indicator ON and OFF with a scan tool. If the indicator does not turn ON and OFF Replace the S79D Window Switch-Driver. If the indicator turns ON and OFF
7. Verify the passenger window moves while commanding the Passenger Window Motor Up and Down with a scan tool. If the passenger window does not move UP and DOWN as commanded Refer to Circuit/System Testing - Driver/Passenger Window Motor Malfunction. If the passenger window moves UP and DOWN as commanded
8. Verify the passenger window moves while commanding the window UP, express UP, DOWN and express DOWN with the S79P Window Switch-Passenger. If the passenger window does not move UP or DOWN as commanded Refer to Circuit/System Testing - Passenger Window Switch Malfunction. If the passenger window does not express UP or express DOWN Normalize the passenger window motor, refer to «Window Motor Programming - Express Function»(/cadillac/ats/i-2012-2014/remont/heated-glassdefoggers/#fixed-and-moveable-window-system) . If after normalization, the passenger window does not express UP or express DOWN Refer to Circuit/System Testing - Passenger Window Switch Malfunction. If the passenger window moves UP, express UP, DOWN and express DOWN as commanded
9. Verify the left rear and right rear window move while commanding the Left Rear Window Motor and Right Rear Window Motor Up and Down with a scan tool. If a rear window does not move UP and DOWN as commanded Refer to Circuit/System Testing - Rear Power Window Inoperative. If the rear window moves UP and DOWN as commanded
10. Command the rear window lockout by pressing the window lockout switch on the S79D Window Switch-Driver.
11. Verify the left rear and right rear window does not move while commanding the window UP and DOWN with the S79LR Window Switch-Left Rear and S79RR Window Switch-Right Rear. If a rear window moves UP and DOWN as commanded Refer to «Power Door Child Lock Malfunction»(/cadillac/ats/i-2012-2014/remont/door-locks-anti-theft-systems/#power-door-lock-system-and-release-systems) . If the rear windows do not move UP and DOWN
12. All OK.

Driver/Passenger Window Motor Malfunction

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the appropriate driver or passenger M74 Window Motor. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 10 ohms between the ground circuit terminal 1 and ground. If 10 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 10 ohms
3. Ignition ON.
4. Verify a test lamp illuminates between the B+ circuit terminal 2 and ground. If the test lamp does not illuminate and the circuit fuse is good Ignition OFF. Test for less than 2 ohms in the B+ circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse. If the test lamp does not illuminate and the circuit fuse is open Ignition OFF. Test for infinite resistance between the B+ circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the M74 Window Motor. If the test lamp illuminates
5. Test or replace the M74 Window Motor.

Driver Window Switch Malfunction

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S79D Window Switch-Driver. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 10 ohms between the ground circuit terminal 1 and ground. If 10 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 10 ohms
3. Ignition ON.
4. Verify a test lamp illuminates between the B+ circuit terminal 4 and ground. If the test lamp does not illuminate and the circuit fuse is good Ignition OFF. Test for less than 2 ohms in the B+ circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse. If the test lamp does not illuminate and the circuit fuse is open Ignition OFF. Test for infinite resistance between the B+ circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the S79D Window Switch-Driver. If the test lamp illuminates
5. Verify the scan tool Driver Window Main Control Down Switch parameter is Inactive. If not Inactive Ignition OFF, disconnect the harness connector at the M74D Window Motor-Driver. Test for infinite resistance between the S79D Window Switch-Driver signal circuit terminal 3 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the M74D Window Motor-Driver. If Inactive
6. Install a 3 A fused jumper wire between the signal circuit terminal 3 and the ground circuit terminal 1.
7. Verify the scan tool Driver Window Main Control Down Switch parameter is Active If not Active Ignition OFF, remove the 3 A fused jumper wire, disconnect the harness connector at the M74D Window Motor-Driver, ignition ON. Test for less than 1 V between the S79D Window Switch-Driver signal circuit terminal 3 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the M74D Window Motor-Driver. If Active
8. Verify the scan tool Driver Window Main Control Up Switch parameter is Inactive. If not Inactive Ignition OFF, disconnect the harness connector at the M74D Window Motor-Driver. Test for infinite resistance between the S79D Window Switch-Driver signal circuit terminal 6 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the M74D Window Motor-Driver. If Inactive
9. Install a 3 A fused jumper wire between the signal circuit terminal 6 and the ground circuit terminal 1.
10. Verify the scan tool Driver Window Main Control Up Switch parameter is Active If not Active Ignition OFF, remove the 3 A fused jumper wire, disconnect the harness connector at the M74D Window Motor-Driver, ignition ON. Test for less than 1 V between the S79D Window Switch-Driver signal circuit 6 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the M74D Window Motor-Driver. If Active
11. Verify the scan tool Driver Window Main Control Express Switch parameter is Inactive. If not Inactive Ignition OFF, disconnect the harness connector at the M74D Window Motor-Driver. Test for infinite resistance between the S79D Window Switch-Driver signal circuit terminal 2 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the M74D Window Motor-Driver. If Inactive
12. Install a 3 A fused jumper wire between the signal circuit terminal 2 and the ground circuit terminal 1.
13. Verify the scan tool Driver Window Main Control Express Switch parameter is Active If not Active Ignition OFF, remove the 3 A fused jumper wire, disconnect the harness connector at the M74D Window Motor-Driver, ignition ON. Test for less than 1 V between the S79D Window Switch-Driver signal circuit 2 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the M74D Window Motor-Driver. If Active
14. Test or replace the S79D Window Switch-Driver.

Passenger Window Switch Malfunction

1. Ignition OFF, and all vehicle systems OFF, disconnect the harness connector at the S79P Window Switch-Passenger. It may take up to 2 minutes for all vehicle systems to power down
2. Test for less than 10 ohms between the ground circuit terminal 1 and ground. If 10 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 10 ohms
3. Ignition ON.
4. Verify the scan tool Passenger Window Switch at Door parameter is Inactive. If not Inactive Ignition OFF, disconnect the harness connector at the M74P Window Motor-Passenger Test for infinite resistance between the signal circuit terminal listed below and ground: S79P Window Switch-Passenger - signal circuit terminal 7 S79P Window Switch-Passenger - signal circuit terminal 8 If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the M74P Window Motor-Passenger. If Inactive
5. Install a 3 A fused jumper wire between the signal circuit terminal 8 and ground
6. Verify the scan tool Passenger Window Switch at Door parameter is Up If not Up Ignition OFF, remove the fused jumper wire, disconnect the harness connector at the M74P Window Motor-Passenger, ignition ON. Test for less than 1 V between the S79P Window Switch-Passenger signal circuit terminal 8 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Ignition OFF, test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the M74P Window Motor-Passenger. If Up
7. Install a 3 A fused jumper wire between the signal circuit terminal 7 and ground.
8. Verify the scan tool Passenger Window Switch at Door parameter is Down If not Down Ignition OFF, remove the fused jumper wire, disconnect the harness connector at the M74P Window Motor-Passenger, ignition ON. Test for less than 1 V between the S79P Window Switch-Passenger signal circuit terminal 7 and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V Ignition OFF, test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the M74P Window Motor-Passenger. If Down
9. Test for greater than 10 V between the signal circuit terminal 6 and ground If less than 10 V Ignition OFF, disconnect the harness connector at the M74P Window Motor-Passenger. Test for infinite resistance between the S79P Window Switch-Passenger signal circuit 6 and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance Test for less than 2 ohms in the signal circuit end to end. If 2 ohms or greater, repair the open/high resistance on the circuit. If less than 2 ohms, replace the M74P Window Motor-Passenger. If greater than 10 V
10. Test or replace the S79P Window Switch-Passenger.

Rear Power Window Inoperative

1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the appropriate S79 Window Switch-Rear. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 10 ohms between the ground circuit terminal 5 and ground. If 10 ohms or greater Ignition OFF. Test for less than 2 ohms in the ground circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, repair the open/high resistance in the ground connection. If less than 10 ohms
3. Ignition ON.
4. Verify a test lamp illuminates between the B+ circuit terminal 8. If the test lamp does not illuminate and the circuit fuse is good Ignition OFF. Test for less than 2 ohms in the B+ circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, verify the fuse is not open and there is voltage at the fuse. If the test lamp does not illuminate and the circuit fuse is open Ignition OFF. Test for infinite resistance between the B+ circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the S79 Window Switch-Rear If the test lamp illuminates
5. Ignition OFF, connect the harness connector at the S79 Window Switch-Rear and disconnect the harness connector at the M74 Window Motor-Rear.
6. Test for less than 5 ohms between the control circuit terminal 1 and ground. If 5 ohms or greater Ignition OFF, disconnect the harness connector at the S79 Window Switch-Rear. Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the S79 Window Switch-Rear. If less than 5 ohms
7. Test for less than 5 ohms between the control circuit terminal 2 and ground. If 5 ohms or greater Ignition OFF, disconnect the harness connector at the S79 Window Switch-Rear. Test for less than 2 ohms in the control circuit end to end. If 2 ohms or greater, repair the open/high resistance in the circuit. If less than 2 ohms, replace the S79 Window Switch-Rear. If less than 5 ohms
8. Connect a test lamp between the control circuit terminal 1 and control circuit terminal 2, ignition ON.
9. Verify the test lamp turns ON when commanding the UP and DOWN states with the S79 Window Switch-Rear. If the test lamp remains OFF during either of the commands Ignition OFF, remove the test lamp, disconnect the harness connector at the S79 Window Switch-Rear. Test for infinite resistance between each control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. If infinite resistance, replace the S79 Window Switch-Rear. If the test lamp remains ON Ignition OFF, remove the test lamp, disconnect the harness connector at the S79 Window Switch-Rear. Test for less than 1 V between each control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the S79 Window Switch-Rear. If the test lamp turns ON during each of the commands
10. Test or replace the M74 Window Motor-Rear.

Rear Window Motor

1. Ignition OFF, disconnect the harness connector at the appropriate M74 Window Motor-Rear.
2. Install a 25 A fused jumper wire between one of the control terminals and 12 V. Momentarily install a jumper wire between the other control terminal and ground. Reverse the jumper wires at least two times, the rear M74 Window Motor should perform the UP and DOWN functions. If the M74 Window Motor does not perform the UP and DOWN functions Replace the M74 Window Motor-Rear. If the M74 Window Motor performs the UP and DOWN functions
3. All OK

Perform the Diagnostic Repair Verification after completing the repair.

1. «Front Side Door Window Switch Replacement - Right Side»(/cadillac/ats/i-2012-2014/remont/heated-glassdefoggers/#fixed-and-moveable-window-system)
2. «Front Side Door Window Switch Replacement - Left Side»(/cadillac/ats/i-2012-2014/remont/heated-glassdefoggers/#fixed-and-moveable-window-system)
3. «Rear Side Door Window Switch Replacement»(/cadillac/ats/i-2012-2014/remont/heated-glassdefoggers/#fixed-and-moveable-window-system)
4. «Front Side Door Window Regulator Motor Replacement»(/cadillac/ats/i-2012-2014/remont/heated-glassdefoggers/#fixed-and-moveable-window-system)
5. «Rear Side Door Window Regulator Motor Replacement»(/cadillac/ats/i-2012-2014/remont/heated-glassdefoggers/#fixed-and-moveable-window-system)

Side Door Window Mechanical Diagnosis

Side Door Window Mechanical Diagnosis

Windshield Replacement

Special Tools

1. BO-24402-A Glass Sealant Remover (Cold Knife)
2. BO-39032 Stationary Glass Removal Tool
3. Use an adhesive that is approved by GM Specification GMW-15672

For equivalent regional tools, refer to Special Tools

1. Open the hood.
2. Remove the windshield wiper arms and blades. Refer to «Windshield Wiper Arm Replacement»(/cadillac/ats/i-2012-2014/remont/wiperwasher-systems/#wiper-system-and-washer-system) .
3. Remove the air inlet grille panel. Refer to «Air Inlet Grille Panel Replacement»(/cadillac/ats/i-2012-2014/remont/wiperwasher-systems/#wiper-system-and-washer-system)
4. Remove the windshield garnish moldings. Refer to «Windshield Garnish Molding Replacement»(/cadillac/ats/i-2012-2014/remont/exteriorinterior-trim/#interior-trim-and-interior-paneling) .
5. Remove the rearview mirror. Refer to «Inside Rearview Mirror Replacement»(/cadillac/ats/i-2012-2014/remont/mirrors/#mirror-system) .
6. Disconnect the electrical connectors, if equipped.
7. Remove the camera, if equipped. Refer to «Front View Camera Replacement (With UGN)»(/cadillac/ats/i-2012-2014/remont/collisionavoidance/#object-detection-system-park-assist-system) , «Front View Camera Replacement (With UFL)»(/cadillac/ats/i-2012-2014/remont/collisionavoidance/#object-detection-system-park-assist-system) .
8. Remove the inside air moisture and windshield temperature sensor, if equipped. Refer to «Inside Air Moisture and Windshield Temperature Sensor Replacement»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#hvac-system-automatic) .
9. Cover to protect the following parts from broken glass: Upper dash pad Defroster outlets and A/C outlets Seats and carpeting
10. Do this from inside the vehicle, use a suitable tool cut around the window separating the window from the urethane adhesive. Leave a base of urethane on the pinchweld flange. The only suitable lubrication is clear water, no oils, lubricates or soaps. BO-24402-A Glass Sealant Remover (Cold Knife). BO-39032 Stationary Glass Removal Tool.
11. With an assistant remove the locator pins (1) and windshield (2) from the vehicle.

Installation Procedure

1. Install the windshield into the opening. Refer to «Adhesive Installation of Windshields»(/cadillac/ats/i-2012-2014/remont/heated-glassdefoggers/#fixed-and-moveable-window-system__adhesive-installation-of-windshields) .
2. Install the air inlet grille panel. Refer to «Air Inlet Grille Panel Replacement»(/cadillac/ats/i-2012-2014/remont/wiperwasher-systems/#wiper-system-and-washer-system)
3. Install the windshield wipers arms and blades. Refer to «Windshield Wiper Arm Replacement»(/cadillac/ats/i-2012-2014/remont/wiperwasher-systems/#wiper-system-and-washer-system)
4. Install the windshield garnish molding. Refer to «Windshield Garnish Molding Replacement»(/cadillac/ats/i-2012-2014/remont/exteriorinterior-trim/#interior-trim-and-interior-paneling) .
5. Install the rearview mirror. Refer to «Inside Rearview Mirror Replacement»(/cadillac/ats/i-2012-2014/remont/mirrors/#mirror-system) .
6. Connect the electrical connectors, if equipped.
7. Install the camera, if equipped. Refer to «Front View Camera Replacement (With UGN)»(/cadillac/ats/i-2012-2014/remont/collisionavoidance/#object-detection-system-park-assist-system) , «Front View Camera Replacement (With UFL)»(/cadillac/ats/i-2012-2014/remont/collisionavoidance/#object-detection-system-park-assist-system) .
8. Install the inside air moisture and windshield temperature sensor, if equipped. Refer to «Inside Air Moisture and Windshield Temperature Sensor Replacement»(/cadillac/ats/i-2012-2014/remont/automatic-hvac-system/#hvac-system-automatic) .
9. Remove the double layer of masking tape around the perimeter of the painted surfaces and the interior trim.
10. Close the hood.

Scheme 5

Front Side Door Window Replacement

Scheme 6

Rear Side Door Window Replacement

Rear Window Replacement

Special Tools

1. BO-24402-A Glass Sealant Remover (Cold Knife)
2. BO-39032 Stationary Glass Removal Tool
3. Use an adhesive that is approved by GM Specification GMW 15672

For equivalent regional tools, refer to Special Tools

Removal Procedure

1. Remove the left and right inside quarter upper trim panel. Refer to «Quarter Upper Trim Panel Replacement»(/cadillac/ats/i-2012-2014/remont/exteriorinterior-trim/#interior-trim-and-interior-paneling) .
2. Disconnect the rear window defogger electrical connectors.
3. Disconnect the OnStar® antenna, if equipped.
4. Disconnect the rear window radio antenna connector.
5. Open the rear compartment lid.
6. Remove the rear window lower seal, if equipped..
7. Cover to protect the following parts from broken glass, seats and carpeting.
8. Do this from inside the vehicle, use a suitable tool cut around the window separating the window from the urethane adhesive. Leave a base of urethane on the pinchweld flange. The only suitable lubrication is clear water, no oils, lubricates or soaps. BO-24402-A Glass Sealant Remover (Cold Knife). BO-39032 Stationary Glass Removal Tool.
9. With an assistant lift the rear locator pins (2) and window (1) from the opening.

1. Install the rear window into the opening. Refer to «Adhesive Installation of Rear Windows»(/cadillac/ats/i-2012-2014/remont/heated-glassdefoggers/#fixed-and-moveable-window-system__adhesive-installation-of-rear-windows) .
2. Install the rear window lower seal, if equipped.
3. Connect the rear window defogger electrical connectors.
4. Install the rear window radio antenna connector.
5. Connect the OnStar® antenna, if equipped. Check the radio and OnStar® system to verify reception.
6. Install the left and right quarter upper trim panel. Refer to «Quarter Upper Trim Panel Replacement»(/cadillac/ats/i-2012-2014/remont/exteriorinterior-trim/#interior-trim-and-interior-paneling) .
7. Close the rear compartment lid.
8. Remove the double layer of masking tape around the perimeter of the painted surfaces and the interior trim.

Scheme 7

Front Side Door Window Switch Replacement - Right Side

Scheme 8

Front Side Door Window Switch Replacement - Left Side

Scheme 9

Rear Side Door Window Switch Replacement

Scheme 10

Front Side Door Window Regulator Replacement

Window Motor Normalized Procedure

A window motor that has not been normalized will no longer perform the express up and express down functions, this may occur during the following conditions

1. When a window motor has been disconnected or replaced
2. When a door harness has been disconnected
3. When the battery has been disconnected or replaced

Note. When DTC B3205 4B & 3210 4B are set, the following warnings will be displayed on the driver information center: Open, then Close Driver Window Open, then Close Passenger Window These warnings will clear once the windows have been "Normalized" and the respective DTC will clear.

To normalize the window motor, follow these steps

1. Ignition ON.
2. Starting with the window completely UP, press and hold the power window switch until the window is fully open and continue holding the switch down for approximately 5 seconds after the window is completely open.
3. Pull the power window switch up until the window is fully closed and continue holding the switch up for approximately 5 seconds after the window is completely closed.

The window should now be normalized and the window should perform the express up and express down functions.

Window Motor Relearn Procedure

A relearn procedure may need to be performed for any Local Interconnect Network (LIN) window motor for the following conditions

1. When the window glass is out of alignment
2. When the window glass has been replaced
3. When the door has been replaced
4. When the window regulator has been replaced

Note. Prior to performing the relearn procedure the vehicle must have all 4 wheels properly inflated and mounted, the vehicle must be sitting on a level surface and all doors must be completely closed and for vehicles equipped with a folding convertible top, the top must be closed and firmly latched..

To relearn the window motor, follow these steps

1. Ignition ON.
2. With a scan tool, select Module Diagnosis, Body Control Module, Configuration/Reset Functions and then select the appropriate Clear Window Learn Values for the window motor requiring the relearn procedure.
3. After the learn procedure, exit the scan tool learn procedure completely, the power window cannot be normalized and will not function until you exit the program.
4. Starting with the window completely UP, press and hold the power window switch until the window is fully open and continue holding the switch down for approximately 5 seconds after the window is completely open.
5. Pull the power window switch up until the window is fully closed and continue holding the switch up for approximately 5 seconds after the window is completely closed.

The window is now reprogrammed.

Scheme 11

Front Side Door Window Regulator Motor Replacement

Scheme 12

Rear Side Door Window Regulator Replacement

Scheme 13

Rear Side Door Window Regulator Motor Replacement

Scheme 14

Front Side Door Window Inner Sealing Strip Replacement

Scheme 15

Rear Side Door Window Upper Reveal Molding Replacement

Scheme 16

Rear Side Door Window Belt Reveal Molding Replacement

Scheme 17

Front Side Door Window Belt Reveal Molding Replacement

Scheme 18

Front Side Door Window Upper Reveal Molding Replacement

Scheme 19

Rear Side Door Window Inner Sealing Strip Replacement

Scheme 20

Front Side Door Window Weatherstrip Replacement

Scheme 21

Rear Side Door Window Weatherstrip Replacement

Adhesive Installation of Windshields

1. Use a urethane adhesive systems which meet GM Specification GMW 15672.
2. Make sure to observe the auto-adhesive curing time before releasing the vehicle per urethane adhesive instructions by the manufacturers.
3. Remove all mounds or loose pieces of urethane adhesive from the pinch-weld area.
4. If the original window is being reused, remove all but a thin film of the existing urethane adhesive from the window surface by using a clean utility knife or razor blade scraper.
5. Inspect for any of the following problems in order to help prevent future breakage of the window: High weld Solder spots Hardened sealer Any other obstruction or irregularity in the pinch-weld flange
6. After repairing the opening as indicated, perform the following steps: Remove all traces of broken glass from the outer cowl panel, seats, floor, and defroster ducts. Clean around the edge of the inside surface of the window with a 50/50 mixture of isopropyl alcohol and water by volume on a dampened lint free cloth.
7. Verify all primers and urethane adhesive are within expiration dates.
8. Shake the pinch-weld primer black for at least 1 minute.
9. Use a new dauber in order to apply the primer to the surface of the pinch-weld flange (1).
10. Allow the pinch-weld primer to dry for approximately 10 minutes.
11. With an assistant, align the locator pins to the pinch-weld flange, dry fit the window (1) to the opening in order to determine the correct position.
12. If equipped, ensure that the windshield locator pins are positioned into the locator slots on the upper pinch-weld flange.
13. Use masking tape in order to mark the locations (1) of the window (2) in the opening.
14. Cut the masking tape in the center and remove the window from the opening.
15. Use a new dauber in order to apply glass prep clear to the area approximately 18 mm (0.71 in) around the entire perimeter of the window inner surface. Immediately wipe the glass primed area using a clean, lint-free cloth.
16. Apply a second coat of the glass prep clear to the same area of the glass.
17. Shake the glass primer black for at least 1 minute.
18. Use a new dauber in order to apply the glass primer black to the same areas (2) that glass prep clear was applied.
19. Allow the glass primer to dry for approximately 10 minutes.
20. Cut the applicator nozzle in order to provide V cut of minimum urethane bead of 8 mm (0.316 in) wide and 12.7 mm (1/2 in) high.
21. Use a cartridge-type caulking gun in order to apply a smooth, continuous bead of urethane adhesive.
22. Use the edge of the window as a guide for the nozzle in order to apply the urethane adhesive (1) to the inner surface of the window (3).
23. With an assistant, position the locators and window (2) to the slots in the pinchweld flange, set the window in place.
24. Align the masking tape (1) lines on the window (2) and the body.
25. Press firmly around the entire periphery of the windshield in order to wet-out the urethane bead.
26. Tape the window to the body in order to minimize movement until the urethane adhesive cures.
27. Make sure to observe the auto-adhesive curing time before releasing the vehicle per auto-adhesive instructions by the manufacturers.
28. Clean any excess urethane adhesive from the body.
29. Use a soft spray of warm water in order to immediately water test the window.
30. Inspect the window for leaks.
31. If any leaks are found, use a plastic paddle in order to apply extra urethane adhesive at the leak point.
32. Retest the window for leaks.
33. Maintain the following conditions in order to properly cure the urethane adhesive: Partially lower a door window in order to prevent pressure buildups when closing doors before the urethane adhesive cures. Do not drive the vehicle until the urethane adhesive is cured. Refer to the above curing times. Do not use compressed air in order to dry the urethane adhesive.
34. Complete the window installation.

Adhesive Installation of Rear Windows

1. Use a urethane adhesive systems which meet GM Specification GMW-15672.
2. Make sure to observe the auto-adhesive curing time before releasing the vehicle per urethane adhesive instructions by the manufacturers.
3. Remove all mounds or loose pieces of urethane adhesive from the pinch-weld area.
4. If the original window is being reused, remove all but a thin film of the existing urethane adhesive from the window surface by using a clean utility knife or razor blade scraper.
5. Inspect for any of the following problems in order to help prevent future breakage of the window: High weld Solder spots Hardened sealer Any other obstruction or irregularity in the pinch-weld flange
6. After repairing the opening as indicated, perform the following steps: Remove all traces of broken glass from the outer cowl panel, seats, floor and defroster ducts. Clean around the edge of the inside surface of the window with a 50/50 mixture of isopropyl alcohol and water by volume on a dampened lint free cloth.
7. Verify all primers and urethane adhesive are within expiration dates.
8. Shake the glass primer black for at least 1 minute.
9. Use a new dauber in order to apply the glass primer black to the surface of the pinch-weld flange (2) that glass prep clear was applied.
10. Allow the glass primer to dry for approximately 10 minutes.
11. With an assistant, dry fit the window (2) to the opening in order to determine the correct position.
12. Ensure that the locator pins (1) are positioned into the locator slots on the upper pinch-weld flange.
13. Use masking tape (1) to mark the locations of the window (2) in the opening.
14. Cut the masking in the center and remove the window from the opening.
15. Use a new dauber in order to apply glass prep clear to the area approximately 18 mm (0.71 in) around the entire perimeter of the window inner surface. Immediately wipe the glass primed area using a clean, lint-free cloth.
16. Apply a second coat of the glass prep clear to the same area of the glass.
17. Shake the glass primer black for at least 1 minute.
18. Use a new dauber in order to apply the glass primer black to the same areas (2) that glass prep clear was applied.
19. Allow the glass primer to dry for approximately 10 minutes.
20. Cut the applicator nozzle in order to provide a minimum urethane bead of 8 mm (0.31 in) wide and 16 mm (0.63 in) high.
21. Use a cartridge-type caulking gun in order to apply a smooth, continuous bead of urethane adhesive.
22. Use the edge of the window as a guide for the nozzle in order to apply the urethane adhesive (1) to the inner surface of the window (3).
23. With an assistant, position the locators (1) and window (2) into the slots of the pinchweld flange, set the window in place.
24. Align the masking tape (1) lines on the window (2) and the body.
25. Press firmly around the entire periphery of the window in order to wet-out the urethane bead.
26. Tape the window to the body in order to minimize movement until the urethane adhesive cures.
27. Make sure to observe the auto-adhesive curing time before releasing the vehicle per auto-adhesive instructions by the manufacturers.
28. Clean any excess urethane adhesive from the body.
29. Use a soft spray of warm water in order to immediately water test the window.
30. Inspect the window for leaks.
31. If any leaks are found, use a plastic paddle in order to apply extra urethane adhesive at the leak point.
32. Retest the window for leaks.
33. Maintain the following conditions in order to properly cure the urethane adhesive: Partially lower a door window in order to prevent pressure buildups when closing doors before the urethane adhesive cures. Do not drive the vehicle until the urethane adhesive is cured. Refer to the above curing times. Do not use compressed air in order to dry the urethane adhesive.
34. Complete the window installation.

Scheme 22

Front Side Door Window Rear Channel Replacement

Full-Cut Method Description

Use only the full cut method, also known in the field as full strip method, when installing windows.

This method includes the following

1. The replacement of a majority of the adhesive bead. Remove all but approximately 2 mm (3/64 in) of the existing bead of adhesive from the pinch-weld flange.
2. Apply pinch-weld primer to any exposed painted areas on the pinch-weld flange.

No mounds or loose pieces of adhesive should remain on the pinch-weld flange. Do not remove all traces of adhesive.

Power Windows System Components

The power window system consists of the following components

1. Driver window switch
2. Passenger window switch
3. Left rear window switch
4. Right rear window switch
5. Window motors in each of the doors
6. 30A Fuse
7. Body control module (BCM)

Scheme 23

Driver and Passenger Express Up and Express Down Window Motors

The driver and passenger doors contains a window motor is smart motor that will detect excessive resistance while performing the express up function and automatically reverse direction to prevent injury to any occupants that may become trapped between the closing window and the door frame. The automatic reverse safety feature can be overridden by pulling and holding the window switch.

The logic circuit within the window motor monitors the up, down and express signal circuits which are normally equal to B+ voltage. When a switch is used on the window switch, the contacts close causing a voltage drop within the appropriate signal circuit. The window motor will detect the voltage drop and will command the window to move in the direction requested.

The driver window switch communicates to the BCM by a serial data circuit. When the driver wishes to control the passenger window, the driver will use the appropriate switch on the driver window switch. When this switch is used, a serial data message is sent to the BCM requesting the passenger window motor command, the BCM will then send a serial data message to the passenger window motor which will then move in the direction requested.

Left Rear, Right Rear Express Down Only Power Window Motors

For the right rear and left rear doors, when their window switch is pressed in the down position, battery positive voltage is applied to their respective window motor control circuit and ground to the other window motor control circuit causing that window to open. When the individual window switch is pulled in the up position, voltage and ground is applied to the window motor in the opposite direction causing that window to close. The return path to ground is supplied through the inactive control circuit being normally grounded through the window switch.

Each rear window switch communicates to the BCM by a serial data circuit. When the driver wishes to control the left rear or right rear window, the driver will use the appropriate switch on the driver window switch. When this switch is used, a serial data message is sent to the BCM requesting a window motor command, the BCM will then send a serial data message to the appropriate rear door window switch which will then command that window to move in the direction requested.

Rear Window and Rear Door Lockout Operation

The operator has the option to disable the rear window switches and the interior rear door handles to prevent the unauthorized opening of the rear door doors and windows while still retaining normal driver and passenger door window and handle functions. The driver door window switch has a lockout switch that will disable the interior rear door handles and the local rear window switches. The rear door latches contain switches that are open when the rear doors are unlocked and closed when the rear doors are locked. The operator will first lock all the doors by pressing the central door lock switch. When the lockout switch is pressed, the BCM will confirm that the rear doors have been locked, if the rear doors are locked the BCM will then command the child lockout latches and will also send a disable command to the local rear window switches. The driver and passenger doors will still function normally by pressing the central door lock switch which will unlock the doors but the child lockout latches will continue to disable the interior rear door handles. Pressing the lockout switch again will signal a command to the BCM to unlatch the rear doors, restore normal interior rear door handle functions and restore normal function of the rear window switches.

If the lockout indicator flashes while commanding the lockout system, indicates that the BCM has detected a fault in the system and that one or both interior rear door handles are not locked out and/or the local rear window switches are not locked out.

Rear Window Defogger System Components

The rear window defogger system consists of the following components

1. HVAC Control Module
2. Radio/HVAC Controls
3. Rear Defogger Relay
4. Rear Defogger Grid
5. Driver Outside Rearview Mirror
6. Passenger Outside Rearview Mirror
7. 40A Fuse

Scheme 24

Rear Window Defogger Operation

The rear defog control system utilizes a single zone backlight design, driven with a single relay configuration. Additionally, up to two outside rear view mirrors can be heated if required. A switch for the customer to control the system is provided within the radio/HVAC controls. Also included in the radio/HVAC controls is an indicator to inform the customer with the current state of the system. The system is only operational when engine is running or during remote start.

Pressing the heated rear window switch causes the radio/HVAC controls to send a serial data message to the HVAC control module requesting rear window defog operation. The HVAC control module upon receipt of the serial data message will provide voltage to the coil side of the rear defogger relay, this will energize the relay causing the relay switch contacts to close allowing B+ voltage to flow through the rear defogger grid control circuit to the rear defogger grid.

When the rear heated window switch is pressed and the engine is running, the rear defog control system will remain active for 10 minutes. After the initial cycle has lapsed, pressing the switch again will continue rear window defogger operation, but the cycle will only last 5 minutes. The rear defog control system will function continuously if the vehicle speed is greater than 70 kilometers per hour (45 mph).

Heated Mirrors

The heated mirrors are also controlled through the rear defogger relay. Whenever the rear window defogger is turned on battery voltage is supplied to the mirror heater elements through the left and right mirror heater element control circuits.

Stationary Window Description

Most stationary windows, specifically windshields, are retained to the body with adhesive which adheres the window to the body, increasing structural integrity. The reinstallation of the windows with adhesive requires complete replacement of the adhesive bead, and is known as the full cut method. All stationary windows must use a adhesive systems which meet GM Specification GMW-15672.

Urethane Adhesive Description

For replacement of any adhesive-installed window, use the full cut method only.

Use an adhesive that is approved by GM, Specification GMW-15672.

Use these materials based on specific manufacturer. Do NOT intermix primers or adhesives from one manufacturer to another.

Always follow the system manufacturers instructions for application, handling, and curing.

Special Tools

Illustration Tool Number/ Description BO-24402-A J-24402-A Glass Sealant Cold Knife Remover BO-39032 J-39032 Stationary Glass Removal Tool BO-39040 J-39040 Quarter Window Remover

See also:
• Diagnostic System Check - Vehicle
• Strategy Based Diagnosis
• Diagnostic Procedure Instructions
• COMPONENT CONNECTOR END VIEWS - INDEX
• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs
• Control Module References
• Diagnostic Repair Verification
• Relay Replacement (Within an Electrical Center)
• Relay Replacement (Attached to Wire Harness)
• Symptom Byte List
• Checking Aftermarket Accessories
• Power Door Child Lock Malfunction
• Windshield Wiper Arm Replacement
• Windshield Garnish Molding Replacement
• Inside Rearview Mirror Replacement
• Front View Camera Replacement (With UGN)
• Inside Air Moisture and Windshield Temperature Sensor Replacement
• Glass and Sheet Metal Handling Warning
• Fastener Caution
• Rear Side Door Weatherstrip Replacement - Door Side
• Radio Front Side Door Speaker Replacement
• Window Retention Warning
• DTC B0283
• Rear Window Replacement
• Symptoms - Fixed and Moveable Windows
• Special Tools
• Adhesive Installation of Windshields
• Adhesive Installation of Rear Windows