Hummer H1 (2006+). Manual - part 356

12-100

Electrical System

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9

Reconnect connectors C30, and C31 to the remote 
entry module. Using a DVOM, back probe C31, 
the pink wire (CKT 117) and the brown wire 
(CKT 118). Using the remote entry transmitter, 
attempt to lock and unlock the drivers door. Does 
the voltage alternate between +12v and –12v?

+12v and –12v

Refer to the 

“Power Lock                               

Inop”           

diagnostic chart.

Replace the 

remote entry 

receiver.

 Anti-Lock Out Inoperative

Step

Action

Value(s)

Yes

No

1

Does the basic power lock system operate nor-
mally?

__

Go to step 2.

Refer to the proper 

repair procedure.

2

With the key in the ignition switch, open the driv-
ers door. Does the warning buzzer sound?

__

Go to step 5.

Go to step 3.

3

Gain access to the back of the drivers door jam 
switch. Back probe the white wire (CKT 159) 
with a DVOM, and check for voltage.
Is the specified voltage present?

+12v

Go to step 5.

Go to step 4.

4

Using a DVOM, check for voltage on the dark 
green wire (CKT 54) Is the specified voltage 
present?

+12v

Replace the driver 

door jam switch.

Repair the open or 

short on CKT 54.

5

Gain access to the diode block. With the drivers 
door open, check for voltage on the white wire 
(CKT 159) at the diode. Is the specified voltage 
present?

+12v

Go to step 6.

Repair the open on 

CKT 159.

6

Check for resistance between ground and the black 
wire (CKT 158) at the diode. Is the specified resis-
tance present?

<0.2

1

Go to step 8.

Go to step 7.

7

Check continuity on the black wire (CKT 158) 
between the diode block and the key warning 
switch. Is the specified resistance present?

<0.2

1

Replace the ignition 

tumbler/key warn-

ing switch.

Repair the open on 

CKT 158.

8

Check the diodes in the diode block. Are they still 
functioning as designed?

__

Go to step 9.

Replace the diode 

block.

9

Gain access to the remote entry module. With a 
DVOM, check the resistance between ground and 
the black wire (CKT 56) at C30. Is the specified 
resistance present?

<0.2

1

Go to step 10

Repair the open or 

short on CKT 56.

10

With C30 disconnected and the key in the ignition 
check for ground on the tan wire (CKT 150) at 
C30. Is a ground signal present?

__

Go to step 11

Repair CKT 150 

between the diode 

block and the remote 

entry module.

11

With C30 disconnected check the red wire (CKT 
160) at C30 for a + signal. Is the specified voltage 
present?

+12v

Replace the remote 

entry module.

Repair CKT 160 

between the remote 

entry module and 

the diode block.

 Remote Entry System Inoperative  (Figure 12-138)

Step

Action

Value(s)

Yes

No

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 Electrical System  12-101

AUTO-DIMMING REAR VIEW MIRROR WITH ELECTRONIC COMPASS AND TEMPERATURE 
(OPTION)

Description

The Auto-Dimming rear view mirror has the capability to change the opacity of the mirror glass to prevent glare. When a following
vehicles head lamps hit the rear light detection sensor, the mirror’s opacity will lessen. The now translucent mirror will allow light
to pass through it. This effectively lessens the glare on the driver, much like moving the angle on a manual mirror.

Removal

1.

Disconnect the mirror jumper harness from the rear of the mirror assembly (Figure 12-66). 

2.

Gently push upward on the mirror head and the compass pod together until the mirror assembly is free of the windshield
button.

Figure 12-66:   Auto-Dimming Mirror Jumper Harness Connection

Installation

1.

Grasp the mirror head with both hands

2.

Slide the mirror down onto the window mount and gently rock side to side until mirror base is seated. Do not force the mirror
onto the mount.

3.

Connect the mirror jumper harness to the rear of the newly installed mirror.

4.

Set calibration and zone adjustments. (Refer to Auto-Dimming compass mirror calibration and zone adjustment).

MIRROR JUMPER

HARNESS

AMBIENT

LIGHT SENSOR

COMPASS

POD

12-102

Electrical System

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AUTO-DIMMING COMPASS MIRROR CALIBRATION AND ZONE ADJUSTMENTS

Calibration Adjustment

1.

Start the engine.

2.

Press and hold the auto-dimming power button until “CAL” appears in the display and release (Figure 12-67).

3.

Drive slowly in a circle away from large metal buildings and power lines until the “CAL” disappears.

Zone Adjustment

1.

Press and hold the mode button until “ZONE” appears in the display (Figure 12-67). 

2.

Each depression of the mode button will change the zone number in sequence. Refer to the zone chart below for the zone
number of your area of operation (Figure 12-68).

3.

When the desired zone is reached, allow the mirror to go to normal mode then turn off the ignition.

Figure 12-67:   Auto-Dimming Rear View Mirror

Figure 12-68:   Magnetic Zone Chart

COMPASS

POD

AUTO-DIMMING

POWER BUTTON

AUTO-DIMMING

POWER L.E.D

REAR LIGHT

DETECTION

SENSOR

MODE

BUTTON

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 Electrical System  12-103

AMBIENT TEMPERATURE SENSOR

Removal

1.

Remove the existing nut, cushioned clamp, and the ambient temperature sensor jumper harness from the body harness 
(Figure 12-69). 

2.

Disconnect the ambient temperature sensor jumper harness from the sensor. 

3.

Remove the self-tapping screw and the ambient temperature sensor from the frame. 

Installation

1.

Install the ambient temperature sensor to the frame with the self-tapping screw (Figure 12-69). 

2.

Connect the ambient temperature sensor harness to the sensor. 

3.

Connect the ambient temperature sensor harness to the body harness.

4.

Using the cushioned clamp, secure the jumper harness to the body harness mounting clamp with existing nut and the bolt. 

Figure 12-69:   Ambient Temperature Sensor 

AMBIENT

BODY

 JUMPER

TEMPERATURE 

SENSOR

 HARNESS

 HARNESS

EXISTING

NUT

SELF-TAPPING

SCREW

CUSHIONED

CLAMP