Hummer H1 Service Manual page 883

12-110 Electrical System
Step
1 Remove the passenger door lock switch from the
bezel. Using a DVOM measure voltage on pin 3
(CKT 517). Is the specified voltage present?
2 Disconnect the passenger door lock switch from
the harness. Using a DVOM check the resistance
to ground on pins 2 (CKT 120), and 4 (CKT 119).
Is the resistance below the specified value?
3 Remove the drivers door lock switch from the
bezel, and disconnect it from the harness. On the
drivers harness place a jumper wire between pins
1 (CKT 120) and 5 (CKT 119). With a DVOM
check for continuity between pins 2 (CKT 120)
and 4 (CKT 119) on the passenger door lock har-
ness. Does the resistance meet the specified
value?
4 Remove the jumper wire from the drivers door
lock switch harness. With a DVOM check the
resistance to ground on the drives door lock
switch harness pins 2 (CKT 58) and 4 (CKT 58).
Does the resistance meet the specified values on
both pins?
5 Connect the door lock switches to their harnesses.
Using a DVOM back probe pins 1 and 5 of the pas-
senger door lock switch. Move the switch to "Lock",
then "Unlock". Does the voltage alternate between
+12v and –12v?
6 Locate connector C31 under the center console.
Using a DVOM probe pin F (CKT 121), and pin
B (CKT 122). Move the passenger lock switch to
"Lock" then "Unlock". Does the voltage alternate
between +12v and –12v?
4-1-00
______________________________________________________
Power Locks Inoperative w/o Keyless
Action Value(s) Yes
12v Go to step 2.
<.2 Ω
Go to step 5.
<.2 Ω
Go to step 4.
<.2 Ω
Replace the
drivers door
lock switch.
+12v and –12v Go to step 6.
+12v and –12v Locate the open
or bad connec-
tion, in CKTS
117 or 118
between C 31
and the door lock
actuator.
®
No
Repair the open,
or bad connection
in CKT 517
between the pas-
senger side door
lock switch and
fuse 3H.
Go to step 3.
Repair the open,
or bad connection
in CKT 120, and/
or CKT 119
between the driv-
ers and passen-
ger door
switches.
Repair the open
or bad connec-
tion in CKT 58
between the driv-
ers door lock
switch and G4.
Replace the
passenger door
lock switch.
Locate the open
or bad connec-
tion in CKTS
121 or 122
between the pas-
senger door lock
switch and C31.