Hummer H1 (2002+). Manual — part 232

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Electrical System 12-149

®

05745159

Figure 12-148: Standard Audio Harness Schematic Model 89.

BK

RD

B

A

LF SPEAKER

BK

RD

B

A

RF SPEAKER

8

7

6

4

3

RADIO

IGNITION

BATT 12V

DIMMER

ILLUMINATION

GROUND

11

12

13

14

LF

LF

RF

RF

C56

00-S12-040

–
+

–
+

4

Ω

4

Ω

813 BK

804 TN

811 BK

805 TN

17 PP

14 LB

137 RD

476 GY

59 BK

C3

PANEL

LIGHT

DIMMER

476 GY

59 BK

FUSE

1F

5 AMP

J6

C1

B4

G3

F3

C60

C

B

A

E

D

FUSE

4G

7.5 AMP

FUSE

2H

10 AMP

H9

K7

FUSE

2F

5 AMP

EXTERNAL
FUSE BOX

137 RD

14 LB

19 YL

H6

B1

37 RD

297 OR

TO BATTERY

TO BATTERY

TO IGNITION

14 LB

17 PP

38 RD

C1-67

HEADLIGHT
SWITCH

G4

OFF

HEAD

PARK

2

1

INTERNAL
FUSE BOX

CIRCUIT

BREAKER

#2

30 AMP

3-1-01

12-150

Electrical System

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®

Figure 12-149: CD Changer To Radio Harness, All Models.

13

11

CD CHANGER

RADIO

16

10

19

12

SHIELD

9

15

15

18

13

C61

14

14

RIGHT

AUDIO

SIGNAL

LEFT

AUDIO

SIGNAL

AUDIO COMMON

DRAIN

GROUND

DATA

BATT

00-S12-002

YL

WT

GY

RD

BK

PP

LEFT
AUDIO
SIGNAL

RIGHT
AUDIO
SIGNAL

AUDIO COMMON

BATT

GROUND

DATA

C58

3-1-01

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Electrical System 12-151

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05745159

SYMPTOM TABLE

SYMPTOM

PROCEDURE

PAGE NUMBER

Display inoperative, no sound from any
speaker.

Chart #1

12-152

No sound from one speaker (Delco
std.).

Chart #2

12-152

No sound from one speaker (Monsoon).

Chart #3

12-153

No sound from any speaker, radio dis-
play operates normally (Monsoon).

Chart #4

12-154

Compact disc player does not operate
properly.

Chart #5

12-155

Cassette player does not operate prop-
erly.

Chart #6

12-156

Antenna system test.

Chart #7

12-157

Rear seat audio does not operate.

Chart #8

12-160

Radio controls are inoperative.

Service radio.

Radio does not turn off.

Service radio.

Radio memory (clock and station pre-
sets) is inoperative.

Check the gray wire (CKT 476) for an
open or high resistance between C56
terminal 7 and fuse 2H of the interior
fuse box.

Display dimming does not vary using
the I/P dimmer switch (I/P dimming
works).

Check the purple wire (CKT 17) for an
open or high resistance between C56
terminal “6” and the panel light dimmer.

Speaker output distorted at high volume
(Monsoon).

Check for open or poor connection in the
black wire (CKT 59) from C62 terminals
“E8” and “E9” to the ground G4. Check
for open or poor connection in the light
green wire (CTK 829) from C62 terminals
“E11” and “E12” to fuse 1D.
If OK, replace amplifier.

3-1-01

12-152

Electrical System

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®

DISPLAY IS INOPERATIVE, NO SOUND FROM ANY SPEAKER

NO SOUND FROM ONE SPEAKER (DELCO STANDARD)

CHART #1

STEP

ACTION

VALUE(S)

YES

NO

1

Disconnect connector C56.
Turn the ignition switch to the “Run”
position.
With a DVOM, measure voltage between
terminal “7” and ground G4.

+12v

Go to step 2.

Repair the poor connection

or open the gray wire (CKT

476) between connector C56

terminal “7” and fuse 2H of

the interior fuse box.

2

With a DVOM, measure the voltage at
connector C56 between terminal “7” and
terminal “8”.

+12v

Go to step 3.

Repair the poor connec-

tion or open in the black

wire (CKT 59) between

connector C56 terminal

“8” and ground G4.

3

With a DVOM measure the voltage at
connector C56 between terminal “4” and
terminal “8”.

+12v

Go to step 4.

Repair open in the red wire

(CKT 137) between connec-

tor C56 terminal 4 and fuse

4G of the interior fuse box.

4

Check for a poor connection at the radio.
If OK, service radio.

CHART #2

ACTION

VALUE(S)

YES

NO

1

Turn the ignition switch to the “off” position.

Disconnect connectors C56, C57 and C58.
With a DVOM, measure the resistance at
the connector C56 between speaker +
and - circuits (see schematics).

4

Ω

Go to step 3.

Go to step 2.

2

With a DVOM, measure the resistance at
the speaker connection from terminal
“A” to terminal “B”.

4

Ω

Repair open or short circuit

in speaker + and - circuits.

Replace speaker.

3

With a DVOM measure the resistance at
the radio connector of the speaker + and -
circuits to ground.

Infinite

resistance.

Go to step 4.

Repair short to ground in

speaker + or - circuit.

4

Check for poor connections at radio or
speaker.
If OK, service radio.

3-1-01