Hummer H1 (2006+). Manual - part 244

7-58

Brake System

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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

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 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

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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

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 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