Hummer H1 (2006+). Manual — part 244
7-58
Brake System
_____________________________________________________________
Figure 7-52: 13 Pin Modulator Connector Female Half
Figure 7-53: 42 Pin Underbody Connector Male Half
33
994
BR
Right rear wheel speed sensor high
34
998
BR
Right front wheel speed sensor high
35
992
BR
Left rear wheel speed sensor high
PIN
CKT
COLOR
DESCRIPTION
1
970
TN
Left front outlet valve activation
2
971
PP
Left front inlet valve activation
4
977
WH
Right rear inlet valve activation
5
976
RD
Right rear outlet valve activation
6
978
BK
Reference ground
9
677
GY
Shuttle valve switch signal
10
972
YL
Right front outlet valve activation
11
973
OR
Right front inlet valve activation
12
975
LB
Left rear inlet valve activation
13
974
DB
Left rear outlet valve activation
PIN
CKT
COLOR
DESCRIPTION
9-S12-014
C11 FEMALE ONLY
CAV 1
CAV 6
CAV 10
CAV 5
CAV 9
CAV 13
9-S12-015
C2 MALE
PIN 34
PIN 28
PIN 22
PIN 16
PIN 10
PIN 1
PIN 42
PIN 33
PIN 27
PIN 21
PIN 15
PIN 9
6-1-05
____________________________________________________________
Brake System 7-59
5745804
Figure 7-54: 42 Pin Underbody Connector Female Half
ABS MODULATOR REPLACEMENT
Removal
WARNING: Batteries must be disconnected when the brake hydraulic system is being serviced and bled. If the ABS
motor pump runs when air is in the hydraulic system, air can get trapped behind the valves in the modulator caus-
ing a spongy brake pedal.
1.
Disconnect the batteries.
2.
Remove the left front splash shield.
3.
Remove the horn bracket and horns (Figure 7-55).
PIN
CKT
COLOR
DESCRIPTION
10
996
BR
Left front wheel speed sensor low signal
11
997
BK
Left front wheel speed sensor high signal
19
999
BK
Right front wheel speed sensor high signal
20
998
BR
Right front wheel speed sensor low signal
22
994
BR
Right rear wheel speed sensor low signal
23
995
BK
Right rear wheel speed sensor high signal
31
992
BR
Left rear wheel speed sensor low signal
32
993
BK
Left rear wheel speed sensor high signal
9-S12-016
C2 FEMALE
CAV 42
CAV 33
CAV 27
CAV 21
CAV 15
CAV 9
CAV 34
CAV 28
CAV 22
CAV 16
CAV 10
CAV 1
6-1-05
7-60
Brake System
_____________________________________________________________
Figure 7-55: Brake Line And Wire Connections
4.
Remove the thirteen-pin, the two-pin and the one-pin wire connectors from the modulator assembly.
5.
Remove the master cylinder brake hoses at the modulator and cap off (note the position of the lines in the modulator for
installation).
6.
Remove the four wheel brake lines from the modulator and cap off (note the position of the lines in the modulator for
installation).
7.
Remove the “P” clamp securing the oil cooler lines to the modulator mounting bracket.
8.
Remove the four bolts, washers and lock washers securing the modulator bracket to the air lift bracket (Figure 7-56).
9-S07-011
2-PIN
PUMP
CONNECTOR
1 AND
13-PIN
CONNECTORS
6-1-05
____________________________________________________________
Brake System 7-61
5745804
Figure 7-56: Modulator and Bracket AssemblyMounting
9.
Remove the modulator, mounting bracket and shield from the vehicle.
10. Remove the motor pump wire connector from the modulator bracket and the two bolts securing the modulator to the bracket.
Figure 7-57: Modulator Mounting
11. Disengage the modulator alignment pin from the mounting bracket and remove the modulator from the mounting bracket.
12. Remove the brake line adapters, noting the position for reinstallation
9-S07-010
AIR
LIFT
BRACKET
9-S07-012
ALIGNMENT
PIN
MOUNTING
BRACKET
MODULATOR
6-1-05
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