GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2000 🢒 DeVille 🢒 Body and Accessories 🢒 Stationary Windows 🢒 Rear Window Defogger Inoperative

Rear Window Defogger Inoperative w/o UY4, UE7, UE9

Test Description

The number(s) below refer to the step number(s) on the diagnostic table.

  1. Command both the ON and OFF states. Repeat the commands as necessary.

Step

Action

Yes

No

SCHEMATIC REFERENCE: Defogger Schematics

1

Did you perform the Defogger Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Defogger

2
  1. Turn ON the ignition, with the engine OFF.
  2. Depress the rear defogger button.
  3. Connect a test lamp between the left side of the rear defogger grid and the right side of the rear defogger grid.

Does the test lamp illuminate?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

3

Inspect the rear defogger fuse for an open.

Is the fuse open?

Go to Step 16

Go to Step 4

4
  1. With a scan tool, observe the rear defogger relay parameter in the Rear Integration Module (RIM) output controls data list
  2. Depress the rear defogger button.

Does the rear defogger relay parameter display ON?

Go to Step 5

Go to Step 22

5

  1. Select from the special functions, the rear defogger relay from the RIM output controls.
  2. With a scan tool, command the rear defogger relay ON and OFF.

Do you hear a click when you command the rear defogger relay ON and OFF?

Go to Step 8

Go to Step 6

6
  1. Turn OFF the ignition.
  2. Remove the rear defogger relay.
  3. Turn ON the ignition, with the engine OFF.
  4. Connect a test lamp between the Ignition 1 voltage circuit of the rear defogger relay coil and a good ground.

Does the test lamp illuminate?

Go to Step 7

Go to Step 17

7
  1. Turn OFF the ignition.
  2. Connect a test lamp between the control circuit of the rear defogger relay and the Ignition 1 voltage circuit of the rear defogger relay coil.
  3. Turn ON the ignition, with the engine OFF.
  4. With a scan tool, command the rear defogger relay ON.

Does the test lamp illuminate?

Go to Step 13

Go to Step 12

8
  1. Turn OFF the ignition.
  2. Remove the rear defogger relay.
  3. Turn ON the ignition, with the engine OFF.
  4. Connect a test lamp between the battery positive voltage circuit of the rear defogger relay switch and a good ground.

Does the test lamp illuminate?

Go to Step 9

Go to Step 18

9
  1. Connect a 40 amp fused jumper between the battery positive voltage circuit of the rear defogger relay switch and the supply voltage circuit of the rear defogger.
  2. Connect a test lamp between the rear defogger grid and a good ground.

Does the test lamp illuminate?

Go to Step 11

Go to Step 10

10

Test the supply voltage circuit of the rear defogger for an open or a high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 23

Go to Step 15

11

Test the ground circuit of the rear defogger for an open or a high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 23

Go to Step 15

12

Test the control circuit of the rear defogger relay for an open or short to battery positive voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 23

Go to Step 14

13

Inspect for poor connections at the rear defogger relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 23

Go to Step 19

14

Inspect for poor connections at the harness connector of the RIM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 23

Go to Step 20

15

Inspect for poor connections at the rear defogger. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 23

Go to Step 21

16

Repair a short to ground in the supply voltage circuit of the rear defogger. Refer to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 23

--

17

Repair an open or a high resistance in the Ignition 1 voltage circuit of the rear defogger relay coil. Refer to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 23

--

18

Repair an open or high resistance in the battery positive voltage circuit of the rear defogger relay switch. Refer to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 23

--

19

Replace the rear defogger relay.

Did you complete the replacement?

Go to Step 23

--

20

Important: Perform the setup procedure for the Rear Integration Module (RIM).

Replace the RIM. Refer to Rear Integration Body Control Module Replacement in Body Control System.

Did you complete the replacement?

Go to Step 23

--

21

Repair or replace the rear window glass. Refer to Rear Window Replacement and Bus Bar/Antenna Terminal Repair .

Did you complete the replacement?

Go to Step 23

--

22

Replace the Instrument Panel Integration Module (IPM). Refer to Instrument Panel Module Replacement in Body Control System.

Did you complete the replacement?

Go to Step 23

--

23

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2

Rear Window Defogger Inoperative w/ UY4,UE7, UE9

Test Description

The number(s) below refer to the step number(s) on the diagnostic table.

  1. Command both the ON and OFF states. Repeat the commands as necessary.

Step

Action

Value(s)

Yes

No

SCHEMATIC REFERENCE: Defogger Schematics

1

Did you perform the Defogger Diagnostic System Check?

--

Go to Step 2

Go to Diagnostic System Check - Defogger

2
  1. Turn ON the ignition, with the engine OFF.
  2. Depress the rear defogger button.
  3. Connect a test lamp between the left side of the rear defogger grid and the right side of the rear defogger grid.

Does the test lamp illuminate?

--

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

3

Inspect the rear defogger fuse for an open.

Is the fuse open?

--

Go to Step 19

Go to Step 4

4
  1. With a scan tool, observe the rear defogger relay parameter in the Rear Integration Module (RIM) output controls data list.
  2. Depress the rear defogger button.

Does the rear defogger relay parameter display ON?

--

Go to Step 5

Go to Step 28

5

  1. Select from the special functions, the rear defogger relay from the RIM output controls.
  2. With a scan tool, command the rear defogger relay ON and OFF.

Do you hear a click when you command the rear defogger relay ON and OFF?

--

Go to Step 8

Go to Step 6

6
  1. Turn OFF the ignition.
  2. Remove the rear defogger relay.
  3. Turn ON the ignition, with the engine OFF.
  4. Connect a test lamp between the Ignition 1 voltage circuit of the rear defogger relay coil and a good ground.

Does the test lamp illuminate?

--

Go to Step 7

Go to Step 20

7
  1. Turn OFF the ignition.
  2. Connect a test lamp between the control circuit of the rear defogger relay and the Ignition 1 voltage circuit of the rear defogger relay coil.
  3. Turn ON the ignition, with the engine OFF.
  4. With a scan tool, command the rear defogger relay ON.

Does the test lamp illuminate?

--

Go to Step 14

Go to Step 13

8
  1. Turn OFF the ignition.
  2. Remove the rear defogger relay.
  3. Turn ON the ignition, with the engine OFF.
  4. Connect a test lamp between the battery positive voltage circuit of the rear defogger relay switch and a good ground.

Does the test lamp illuminate?

--

Go to Step 9

Go to Step 21

9
  1. Connect a 40 amp fused jumper between the battery positive voltage circuit of the rear defogger relay switch and the supply voltage circuit of the rear defogger.
  2. Connect a test lamp between the rear defogger grid and a good ground.

Does the test lamp illuminate?

--

Go to Step 11

Go to Step 10

10
  1. Turn OFF the ignition.
  2. Disconnect the radio TV antenna signal module.
  3. Turn ON the ignition, with the engine OFF.
  4. Connect a test lamp between the supply voltage circuit of the rear defogger and a good ground.

Does the test lamp illuminate?

--

Go to Step 17

Go to Step 22

11
  1. Turn OFF the ignition.
  2. Disconnect the fused jumper.
  3. Measure the resistance from the rear defogger grid to a good ground.

Is the resistance within the specified range?

1-5 ohms

Go to Step 16

Go to Step 12

12

Test the ground circuit of the rear defogger for an open or a high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 29

Go to Step 18

13

Test the control circuit of the rear defogger relay for an open or short to battery positive voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 29

Go to Step 15

14

Inspect for poor connections at the rear defogger relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 29

Go to Step 23

15

Inspect for poor connections at the harness connector of the RIM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 29

Go to Step 24

16

Inspect for poor connections at the rear defogger. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 29

Go to Step 25

17

Inspect for poor connections at the radio TV antenna signal module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 29

Go to Step 26

18

Inspect for poor connections at the TV Antenna Module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 29

Go to Step 27

19

Repair a short to ground in the supply voltage circuit of the rear defogger. Refer to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 29

--

20

Repair an open or a high resistance in the Ignition 1 voltage circuit of the rear defogger relay coil. Refer to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 29

--

21

Repair an open or high resistance in the battery positive voltage circuit of the rear defogger relay switch. Refer to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 29

--

22

Repair an open or high resistance in the supply circuit of the rear defogger. Refer to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 29

--

23

Replace the rear defogger relay.

Did you complete the replacement?

--

Go to Step 29

--

24

Important: Perform the setup procedure for the Rear Integration Module (RIM).

Replace the RIM. Refer to Rear Integration Body Control Module Replacement in Body Control System.

Did you complete the replacement?

--

Go to Step 29

--

25

Repair or replace the rear window glass. Refer to Rear Window Replacement and Bus Bar/Antenna Terminal Repair .

Did you complete the replacement?

--

Go to Step 29

--

26

Replace the radio TV antenna signal module.

Did you complete the replacement?

--

Go to Step 29

--

27

Replace the TV Antenna Module. Refer to Television Antenna Module Replacement .

Did you complete the replacement?

--

Go to Step 29

--

28

Replace the Instrument Panel Integration Module (IPM). Refer to Instrument Panel Module Replacement in Body Control System.

Did you complete the replacement?

--

Go to Step 29

--

29

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 2