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 

_____________________________________________________

 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