Hummer H1 (2002+). Manual - part 208

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 Electrical System  12-59

®

05745159

Figure 2-79:   Lights Schematic (Sheet 2 of 2)

9-S12-007.1

20A

CB

MAXI

FUSE 2M

EXTERIOR

TO BATTERY

30A

CB

MAXI

FUSE 3M

EXTERIOR

TO BATTERY

15 WH

14 LB

15 WH

14 LB

20 RD

12 OR

13 TN

3 LB

80 WH

2 LG

21 GY

BUSS L1A

5 DG

9 YL

FUSE 3F

7.5 A

INTERIOR

FUSE 4F

7.5 A

INTERIOR

FUSE 6F

5 A

INTERIOR

HEADLIGHT FEED

TURN SIGNAL SWITCH

HIGH BEAM

LOW BEAM

LEFT TURN SIGNAL

RIGHT TURN SIGNAL

LEFT TURN REAR

RIGHT TURN REAR

C1-67

C1-51

FUSE 6F

5 A

INTERIOR

BACKUP

LIGHT

SWITCH

C2-27

C1-43

HOT in RUN

and START

298 BR

140 OR

MASTER

LIGHT

SWITCH

4-1-00

12-60

Electrical System

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®

Figure 2-80:   Key/Headlight Chime Schematic

FUSE

7F

5 AMP

INTERIOR

FUSE

1G

5 AMP

INTERIOR

KEY, HEADLIGHT, SEATBELT CHIME

G4

59 BK

640 BR

450 PK

85 GY

159 WH

183 TN

158 BK

KEY SWITCH

(STEERING COLUMN)

G4

59 BK

SEAT BELT

SWITCH

85 GY

38 RD

95 YL

MASTER LIGHT SWITCH

TO

DOME
LIGHT

FUSE

5H

15 AMP

INTERIOR

TO BATTERY

DOOR
SWITCHES

RF

LF

RR

LR

HMCS

ONLY

CARGO

DOOR

G

C1 C3

30 AMP

CB

MAXI FUSE
3M ENGINE

TO BATTERY

C1 G7

C1-51

14 LB

TO TURN

SIGNAL

SWITCH/

DIMMER

15 WH

TO
PARKING
LIGHTS
FUSES

20 AMP

CB

MAXI FUSE
2M ENGINE

SEAT
BELT

RIGHT SIDE

WARNING

LIGHT-1P

TO

IGN

9-S12-003

4-1-00

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 Electrical System  12-61

®

05745159

HORN 

Horn Replacement

Removal 

1.

Remove harness connectors and adapters from horn.

2.

Remove nut and horn from mounting bracket
(Figure 2-81).

NOTE: Overtightening horn mounting nut will distort the horn
bellows and result in an “off-key” horn tone.

Installation 

1.

Secure horns to mounting bracket with nuts.

2.

Plug harness connectors and adapters into horns.

Figure 2-81:   Horn and Horn Mounting Bracket 

Replacement

Horn Mounting Bracket Replacement

Removal 

1.

Remove two horns.

2.

Remove bolts, washers, lockwashers, nuts, and horn
mounting bracket from airlift bracket (Figure 2-81).

Installation 

1.

Secure horn mounting bracket to airlift bracket with bolts, 
washers, lockwashers, and nuts (Figure 2-81).

2.

Install two horns.

HORN

MOUNTING

BRACKET

HARNESS CONNECTORS

NUT

HORN

ADAPTERS

4-1-00

12-62

Electrical System

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®

 Horns Inoperative

Step

Action

Value Yes

No

1

Locate the horn assemblies under the hood.            
Disconnect the harness from the horn assemblies. 
With a DVOM check the black wires (CKT 58) for 
resistance to ground. Do both wires meet with      
specifications?

<.2 

Ω

Go to step 2.

Repair the open 

or bad connection 

on CKT 58 

between the horn 

assemblies and 

G2.

2

With a DVOM back probe the white wires on the 
horn assemblies and check for voltage when the 
horn button is pushed. Is the specified voltage 
present?

12v

Replace the horn 

assemblies.

Go to step 3.

3

Remove the horn relay from the exterior fuse box. 
With a DVOM check resistance between the relay 
cavity 1F and the white wire (CKT 6) on the horn 
assembly. Does the resistance meet the                 
specifications?

<.2 

Ω

Go to step 4.

Repair the open 

or bad connection 

in CKT 6 

between the horn 

relay and the 

horn assembly. 

4

With a DVOM check for voltage in cavities 3E 
and 1E  of the exterior fuse box. Is the specified 
voltage present?

12v

Go to step 5.

Repair the open 

or bad connection 

in CKT 7 

between the horn 

relay and the 

exterior fuse box.

5

With a DVOM check the resistance to ground on 
cavity 3F, of the exterior fuse box, when the horn 
switch is pressed. Does the resistance meet the 
specifications?

<.2 

Ω

Replace the 

horn relay.

Go to step 6.

6

Gain access to connector C39. With a DVOM 
back probe cavity C on connector 39. Activate the 
horn switch and watch the resistance on the meter. 
Does the resistance meet the specifications?

<.2 

Ω

Repair the open 

or bad connection 

on CKT 1 

between the horn 

switch and the 

horn relay.

Replace the turn 
signal assembly.

4-1-00