Hummer H2. Manual - part 327

VANITY MIRROR LAMP(S) INOPERATIVE 

Vanity Mirror Lamp(s) Inoperative 

Refer to Circuit Testing and Wiring Repairs in 
Wiring Systems. 
Did you find and correct the condition?

Go to Step 21

Go to Step 15

13

Inspect for poor connections at the IPC. 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 21

Go to Step 17

14

Inspect for poor connections at the multifunction turn 
signal switch. 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 21

Go to Step 19

15

Inspect for poor connections at the turn signal/hazard 
flasher 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 21

Go to Step 20

16

Repair the ground circuit of the inoperative lamp. Refer 
to Wiring Repairs in Wiring Systems. 
Did you complete the repair?

Go to Step 21

-

17

Replace the IPC. Refer toInstrument Panel Cluster 
(IPC) Replacement in Instrument Panel, Gauges, and 
Console.Did you complete the repair?

IMPORTANT:

Perform the set up procedure for the IPC.

Go to Step 21

-

18

Replace or repair the inoperative bulb/socket. 
Did you complete the repair?

Go to Step 21

-

19

Replace the multifunction turn signal switch. Refer to 
Multifunction, Turn Signal Switch Replacement in 
Steering Wheel and Column. 
Did you complete the repair?

Go to Step 21

-

20

Replace the turn signal/hazard flasher module. 
Did you complete the repair?

Go to Step 21

-

21

Operate the system in order to verify the repair. 
Did you correct the condition?

System OK

Go to Step 3

Step

Action

Yes

No

Schematic Reference: Interior Lights Schematics 
Connector End View Reference: Lighting Systems Connector End Views or Body Control System 
Connector End Views in Body Control System.

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Lighting Systems - Hummer H2

  

REPAIR INSTRUCTIONS 

STOP LAMP SWITCH REPLACEMENT 

Removal Procedure 

1

Did you perform the Lighting Diagnostic System 
Check?

Go to Step 2

Go to Diagnostic 

System Check - 

Lighting Systems

2

Turn ON the vanity mirror lamp. 
Does the system operate normally?

Go to Testing for 

Electrical Intermittents 

in Wiring Systems

Go to Step 3

3

Are all of the reading, visor and I/P compartment 
lamps inoperative?

Go to Step 4

Go to Step 6

4

Is the TBC 2C Fuse in the I/P fuse block open?

Go to Step 5

Go to Step 6

5

Test the battery positive voltage circuit of the BCM 
for a short to ground. Refer to Circuit Testing and 
Wiring Repairs in Wiring Systems. 
Did you find and correct the condition?

Go to Step 12

Go to Step 9

6

Test the inadvertent power supply voltage circuit of 
the vanity lamp for a short to ground, high 
resistance or an open. Refer to Circuit Testing and 
Wiring Repairs in Wiring Systems. 
Did you find and correct the condition?

Go to Step 12

Go to Step 7

7

Test the ground circuit of the vanity lamp for high 
resistance or an open. Refer to Circuit Testing and 
Wiring Repairs in Wiring Systems. 
Did you find and correct the condition?

Go to Step 12

Go to Step 8

8

Inspect the inoperative bulb for an open filament. 
Is the bulb OK?

Go to Step 11

Go to Step 10

9

Repair the inadvertent power supply voltage circuit 
for a short to ground. Refer to Wiring Repairs in 
Wiring Systems. 
Did you complete the repair?

Go to Step 12

-

10

Replace the inoperative bulb. 
Did you complete the replacement?

Go to Step 12

-

11

Replace the sunshade. Refer to Sunshade 
Replacement in Interior Trim. 
Did you complete the replacement?

Go to Step 12

-

12

Operate the system in order to verify the repair. 
Did you correct the condition?

System OK

Go to Step 3

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Lighting Systems - Hummer H2

  

Fig. 30: Stop Lamp Switch & Pushrod Retaining Clip 
Courtesy of GENERAL MOTORS CORP. 

1. Disconnect the electrical connector from the stop lamp switch (2).  

2. Remove the pushrod retaining clip (4).  

3. Remove the stop lamp switch (2).  

Installation Procedure 

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Lighting Systems - Hummer H2

  

Fig. 31: Stop Lamp Switch & Pushrod Retaining Clip 
Courtesy of GENERAL MOTORS CORP. 

1. Install the stop lamp switch (2).  

2. Install the pushrod retaining clip (4).  

3. Connect the electrical connector to the stop lamp switch (2).  

HEADLAMP SWITCH REPLACEMENT 

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Lighting Systems - Hummer H2