Hummer H1 (2002+). Manual — part 227

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Electrical System 12-133

®

05745159

Figure 12-130: Compass Mirror Schematic

COMP

ASS

IGNITION

FUSE

2C

10 AMP

FUSE

3C

7.5 AMP

COMPASS

MIRROR

GROUND

TEMP

SENSOR

407 PK

400 LG

140 OR

59 BK

767 BR

B

F

G

A

D

C1-61

C2-8

G4

G2

TO HEATED
WINDSHIELD
SWITCH

G4

59 BK

400 LG

TO

IGNITION

SWITCH

TO

IGNITION

SWITCH

580 BR

TEMP

SENSOR

00-S12-003.1

COMPASS

CUTOUT

RELAY

INTERIOR

FUSE

BOX

C13

BACK-UP
LIGHT
SWITCH

298 BR

58 BK

C2-26

REVERSE

INHIBIT

IGNITION

C2-27

C1-43

GROUND

768 BK

E

4

1

3

2

6

7

4-1-00

12-134

Electrical System

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®

POWER SIDE MIRROR

Description

The side mirrors have an option of an internal heater element
to aid in defrosting. Heated side mirrors will only be available
if the truck is equipped with a heated windshield.

The power side mirror system components are: two side mir-
rors with internal vertical and horizontal control motors (and
optional heater elements), the power mirror switch, and the
heated windshield switch (optional).

Power Side Mirror Replacement

Removal

1.

Remove the three mounting screws securing the power
mirror assembly and gasket to mounting plate (Figure 12-
130.2).

2.

Disconnect the power mirror assembly connector from the
door jumper harness.

3.

Inspect the gasket and replace if damaged.

Installation

NOTE:

Ensure the door jumper harness is routed through the

gasket before connecting the harness to the power mirror as-
sembly.

1.

Connect the power mirror assembly connector to the door
jumper harness (Figure 12-130.2).

NOTE:

Wires from the power mirror assembly must be coiled

in the mirror housing to ensure clearance to the attachment
points.

2.

Align the power side mirror and the gasket with the
mounting plate on the door.

3.

Install the three mounting screws

.

3-1-01

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Electrical System 12-134.1

®

05745159

Figure 12-130.2 Power Mirror Assembly Removal

POWER MIRROR

ASSEMBLY

MOUNTING

SCREW

CONNECTOR

GASKET

MOUNTING

PLATE

DOOR

JUMPER

HARNESS

DOOR

JUMPER

HARNESS

CONNECTOR

3-1-01

12-134.2

Electrical System

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®

Power Side Mirrors Inoperative

Step

Action

Value(s)

Yes

No

1

Are both mirrors INOP?

Go to step 2.

Go to step 4.

2

Remove the power mirror switch. With a DVOM check
circuit 517 (PK) for battery voltage. Is the specified
voltage present?

> 12.6v

Go to step 3.

Repair circuit 517

(PK) between the

power mirror switch

and fuse 3H in the

interior fuse box.

3

With a DVOM check the resistance to ground on cir-
cuit 59 (BK). Does the resistance meet the specifica-
tions?

< 0.2

Ω

Replace the power

mirror control

switch.

Repair circuit 59

(BK) between the

power mirror switch

and ground G4.

4

Is only the left side power mirror INOP?

Go to step 5.

Go to step 7

5

Remove the left side power mirror. With a DVOM
back probe circuits 942 (OR) with the positive lead,
and circuit 59 (BK) with the negative lead. With the
DVOM set to check voltage move the power mirror
switch to the left side and then up. In both cases the
voltage should change from 0v to 12v. Does the volt-
age change?

0v - off

12v - left

0v - off

12v - up

Replace the power

side mirror.

Go to step 6.

6

With a DVOM check resistance on circuit 942 (OR)
between the power side mirror and the power mirror
control switch. Does the resistance on the circuit meet
specifications?

< 0.2

Ω

Replace the power

mirror switch.

Repair circuit 942

(OR) between the
power side mirror

and the power win-

dow switch.

7

Remove the left side power mirror. With a DVOM
back probe circuits 944 (OR) with the positive lead,
and circuit 59 (BK) with the negative lead. With the
DVOM set to check voltage move the power mirror
switch to the left side and then up. In both cases the
voltage should change from 0v to 12v. Does the volt-
age change?

0v - off

12v - left

0v - off

12v - up

Replace the power

side mirror.

Go to step 8.

8

With a DVOM check resistance on circuit 944 (OR)
between the power side mirror and the power mirror
control switch. Does the resistance on the circuit meet
specifications?

< 0.2

Ω

Replace the power

mirror switch.

Repair circuit 944

(OR) between the
power side mirror

and the power win-

dow switch.

3-1-01