Hummer H1 (2002+). Manual — part 222

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Electrical System 12-113

®

05745159

Cargo Door Lock Inoperative

Step

Action

Value(s)

Yes

No

1

Does power the lock system on vehicle operate
correctly?

Go to step 2.

Refer to the

diagnostic charts

that apply.

2

Open the primary cargo door. Using a DVOM
measure the voltage across the brass door contacts
on the body. Operate the door locks in both
“Lock” and “Unlock”. Does the voltage pulse
+12v then –12v?

+12v then –12v

Go to step 3.

Go to step 4.

3

Remove inner door panel and disconnect door
lock actuator. Using a DVOM set to measure
resistance, measure continuity between the door
contacts and door lock actuator on CKTS 117 and
121. Does the resistance meet the specification?

<.2

Ω

Replace the door

lock actuator.

Locate the open

or bad connection

in CKT 117 or

121.

4

Gain access to cargo door lock delay module. Dis-
connect the module connector. Using a DVOM set
to measure voltage, probe pins 9 (CKT 517), and 3
(CKT 59). Is the specified voltage present?

12v

Go to step 6.

Go to step 5.

5

Check the voltage drop on pin 9 (CKT 517). Is the
specified voltage present?

12v

Repair the open

or bad connec-

tion in CKT 59

between the

cargo door lock

delay module

and G4.

Repair the open

or bad connec-

tion in CKT 517

between the

cargo door lock

delay module

and fuse 3H.

6

Using a DVOM set to measure voltage, probe pin
5 (CKT 118) of the cargo door lock delay module
and pin 3. Move a door switch to “Unlock”. Is the
specified voltage present?

12v

Go to step 7.

Repair the open

or bad connec-

tion, in CKT118

between the

cargo door lock

module and

door lock

switches.

7

Using a DVOM probe pins 6 (CKT 117), and 10
(CKT 121) at the cargo door lock delay module
connector. Operate the door lock switch in both
“Lock” and “Unlock”. Does the voltage alternate
between +12v and -12v?

+12v and –12v

Repair open or

bad connection in

CKT 117 or 118

between the

cargo door lock

delay module and

door contacts.

Replace cargo

door lock delay

module.

4-1-00

12-114

Electrical System

______________________________________________________

®

Remote Entry System Inoperative

Step

Action

Value(s)

Yes

No

1

Does the panic feature operate when the button is
depressed on the transmitter?

Go to step 6.

Go to step 2.

2

Does the L.E.D. illuminate on the keyless
transmitter when a button is depressed?

Go to step 4.

Go to step 3.

3

Measure the battery voltage of the transmitter bat-
tery.Is the specified voltage present?

> +5v

Replace the

transmitter.

Replace the

transmitter

battery

4

Attempt to re-synchronize the transmitter to the
receiver. Is the problem repaired.

No further

action required.

Go to step 5.

5

Reprogram the receiver to the transmitters. Is the
problem solved?

No further

action required.

Go to step 6.

6

Gain access to the receiver under the console.
Disconnect connector C30 from the receiver.
Using a DVOM measure the voltage drop
between pins G (CKT 554) and A(CKT 58). Is the
specified voltage present?

12v

Go to step 8.

Go to step 7.

7

Using a DVOM measure the resistance to ground
at C30 pin A(CKT58). Does the resistance meet
the specified value?

<.2

Ω

Repair the open

or bad connec-

tion in CKT 554

between the

receiver and fuse

1H

Repair the open

or bad connection

in CKT58

between receiver

and G4

8

Using a DVOM check the voltage drop between
C30 pin A (CKT 58) and C31 pin D (CKT 517).
Is the specified voltage present?

12v

Go to step 9.

Repair the open

or bad connection

in CTK 517.

9

Reconnect C30, and C31 to the remote entry
module. Using a DVOM, back probe C31, pins G
(CKT 117) and A (CKT 118). Using the remote
entry transmitter, attempt to lock and unlock driv-
ers door. Does voltage alternate between +12v
and –12v?

+12v and –12v

Refer to the

“Power Lock

INOP”

diagnostic chart.

Replace the

remote entry

receiver.

4-1-00

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Electrical System 12-115

®

05745159

Figure 12-110: Power Locks HMCS W/ Remote Entry

L/R DOOR

LOCK ACTUATOR

R/R DOOR

LOCK ACTUATOR

CARGO DOOR

LOCK ACTUATOR

117 PK

118 BR

FUSE 3H

20A

INTERIOR

G4

1

2

3

4

5

119 TN

E

C17-A

A

B

L

U

3

4

5

2

1

120 LG

517 OR

121 YL

117 PK

118 BR

L/F DOOR

LOCK ACTUATOR

D

E

M

U

L

M

L

U

M

U

L

M

U

L

C22

B

A

R/F DOOR

LOCK ACTUATOR

E

D

B

A

122 PP

9-S12-073

C19

C18

M

U

L

C21

117 PK

G

F

E

D

B

A

C

D

C16

C

D

C14

H

U

L

117 PK

C48

C49

C14

C15-A

C16

56 BK

E

F

A

DRIVER

DOOR

UNLOCK

COMMON

UNLOCK

DOOR

UNLOCK

COMMON

UNLOCK

LOCK

ALL

DOORS

GROUND

58 BK

C31

C30-A

COMMON

UNLOCK

LEFT FRONT DOOR

LOCK SWITCH

RIGHT FRONT DOOR

LOCK SWITCH

BATT

REMOTE ENTRY MODULE (REM)

118 BR

9

6

10

5

GROUND

C47

CARGO DOOR

LOCK MODULE

LOCK
SIGNAL

LOCK
COMMAND

UNLOCK

BATT

121 YL

117 PK

517 OR

59 BK

517 OR

C20-A

C20-B

3

DOOR

CONTACTS

F

B

G4

G4

12-116

Electrical System

______________________________________________________

®

Figure 12-111: Power Locks HMCS W/O Remote Entry

B

L/R DOOR

R/R DOOR

CARGO DOOR

117 PK

118 BR

FUSE 3H

20A

INTERIOR

G4

1

2

3

4

5

119 TN

E

C17-A

A

B

L

U

3

4

5

2

1

120 LG

517 OR

121 YL

1

17 PK

118 BR

L/F DOOR

LOCK ACTUATOR

D

E

M

U

L

M

L

U

M

U

L

M

U

L

C22

B

A

R/F DOOR

LOCK ACTUATOR

E

D

B

A

122 PP

9-S12-075

C19

C18

M

U

L

C21

117 PK

C

D

C16

C

D

C14

U

L

1

17 PK

C48

C49

C14

C15-A

C16

56 BK

E

F

A

LOCK SWITCH

LOCK SWITCH

BATT

118 BR

9

6

10

5

GROUND

C47

CARGO DOOR

LOCK MODULE

LOCK
SIGNAL

LOCK
COMMAND

UNLOCK

BATT

121 YL

117 PK

517 OR

59 BK

517 OR

C20-A

C20-B

3

G

C31

C31 (JUMPER)

F

E

D

B

A

G

F

E

D

B

A

H

H

DOOR

CONTACTS

F

G4