Brake Shift Interlock Cable Inoperative - Hummer H1 Service Manual

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IGNITION SWITCH REPLACEMENT
Removal
1. Remove steering column covers.
2. Remove multi switch.
3. Remove screw and interlock cable from ignition switch
(Figure 2-76).
4. Remove two capscrews and ignition switch from steering
column.
Installation
1. Apply thread-locking compound to capscrew threads and
install ignition switch on steering column with two cap-
screws.
2. Install interlock cable on ignition switch with screw.
3. Install multi switch.
4. Install steering column covers.
5. Ensure ignition switch operates properly.
STEP
1 Gain access to the brake/shift interlock solenoid.
Using a DVOM check for ground on the black
wire (CKT 59). Does the resistance meet the
specifications?
2 With the ignition switch in the "run" position
check the voltage at the tan wire (CKT 83). Is the
specified voltage present?
3 With the ignition switch in the "run" position and
the brake switch applied check the voltage at the
red wire (CKT 22) on the brake shift interlock
solenoid. Is the specified voltage present?
4 Gain access to the brake switch. With a DVOM
check the voltage at the orange wire (CKT 10). Is
the specified voltage present?
05745159

Brake Shift Interlock Cable Inoperative

ACTION
Electrical System
Brake Shift Interlock Cable System Descrip-
tion (Figure 2-76)
The purpose of the brake shift interlock cable is to prevent a
driver from engaging a transmission gear before the brakes are
applied. When the brake pedal is depressed, voltage from the
brake switch de-energizes the interlock solenoid and the cable
relaxes. The transmission shift lever can then be pulled out of
the park position. If electrical power is lost due to a dead bat-
tery or system failure, the solenoid defaults to the open posi-
tion. With the brake/shift interlock solenoid in the open
position the shifter may be moved to any position.
Figure 2-76: Brake Shift Interlock Cable
VALUES
<.2 Ω
Go to step 2.
12v Go to step 3.
12v Replace the
brake shift inter-
lock cable.
12v Replace the
brake switch.
12-51
SOLENOID
YES NO
Repair the open or
bad connection in
CKT 59 between
the interlock sole-
noid and G4.
Repair the open or
bad connection in
CKT 83 between
the interlock cable
and fuse 1C in the
interior fuse box.
Go to step 4.
Repair the open or
bad connection on
CKT 10 between
the brake switch
and fuse 4D.
3-1-01