Honda Civic. Manual — part 1098

2. Clear the DTC with the HDS.
3. Turn the ignition switch to LOCK (0), then turn it ON (II) again.
4. Check for DTCs with the HDS.

CONNECTOR TERMINAL DESCRIPTION

Is DTC 121-xx, 122-xx, 123-xx, or 124-xx indicated?

YES -Replace the VSA modulator-control unit (see VSA MODULATOR-
CONTROL UNIT REMOVAL AND INSTALLATION ).

NO -Intermittent failure, the system is OK at this time.

SYMPTOM TROUBLESHOOTING

DTC

Sectional

Valve

121

-01

Right-front and left-rear

Regulator

-02
-11
-21
-24

122

-01

Suction

-21
-22
-23

123

-01

Left-front and right-rear

Regulator

-02
-11
-21
-24

124

-01

Suction

-21
-22
-23

2008 Honda Civic GX

2006-08 BRAKES VSA System - Civic (All Except Hybrid)

ABS indicator or VSA indicator does not go off, and no DTCs are stored

1. Check for the communication between the vehicle and the HDS.

Is there the communication?

YES -Check for loose terminals in the gauge control module (tach) 36P
connector. If necessary, substitute a known-good gauge control module (tach),
then recheck. If it is OK, replace the original gauge control module (tach) (see
REPLACEMENT ).

NO -If the HDS does not communicate with all the system of the vehicle,
troubleshoot the DLC circuit (see DLC CIRCUIT TROUBLESHOOTING ).
If the HDS does not communicate with only VSA, go to step 2.

2. Turn the ignition switch to LOCK (0).
3. Check the No. 4 (7.5 A) fuse in the under-dash fuse/ relay box.

Is the fuse blown?

YES -Install the new No. 4 (7.5 A) fuse, and recheck. If the fuse continues to
blow, check for short to body ground in the wire between the No. 4 (7.5 A)
fuse in the under-dash fuse/relay box and the VSA modulator-control unit. If
necessary, substitute a known-good VSA modulator-control unit (see VSA
MODULATOR-CONTROL UNIT REMOVAL AND INSTALLATION ),
and retest.

NO -Reinstall the checked fuse, then go to step 4.

4. Disconnect the VSA modulator-control unit 37P connector.
5. Turn the ignition switch ON (II).
6. Measure voltage between VSA modulator-control unit 37P terminal No. 28 and

body ground.

2008 Honda Civic GX

2006-08 BRAKES VSA System - Civic (All Except Hybrid)

Fig. 57: Measuring Voltage Between VSA Modulator-Control Unit 37P
Terminal No. 28 And Body Ground

Is there battery voltage?

YES -Go to step 7.

NO -Repair open in the wire between the No. 4 (7.5 A) fuse in the under-dash
fuse/relay box and the VSA modulator-control unit.

7. Turn the ignition switch to LOCK (0).
8. Check for continuity between VSA modulator-control unit 37P terminal No. 36

and body ground.

Fig. 58: Checking Continuity Between VSA Modulator-Control Unit 37P
Terminal No. 36 And Body Ground

Is there continuity?

YES -Check for loose terminals in the VSA modulator-control unit 37P
connector, clean terminal G202 and recheck. If necessary, substitute a known-

2008 Honda Civic GX

2006-08 BRAKES VSA System - Civic (All Except Hybrid)

good VSA modulator-control unit (see VSA MODULATOR-CONTROL
UNIT REMOVAL AND INSTALLATION ), and retest.

NO -Repair open in the wire between the VSA modulator-control unit and
body ground (G202).

BRAKE SYSTEM INDICATOR DOES NOT GO OFF, AND NO DTCS ARE STORED

1. Release the parking brake.
2. Turn the ignition switch ON (II).
3. Check the brake system indicator for several seconds when the ignition switch

is turned ON (II).

Does the indicator come on then go off?

YES -Intermittent failure, the system is OK at this time. Check for loose
terminals between the gauge control module (tach) 36P connector and the VSA
modulator-control unit 37P connector. Refer to INTERMITTENT
FAILURES TROUBLESHOOTING (see ).

NO -Go to step 4.

4. Check the BRAKE INDICATOR in the VSA DATA LIST with the HDS.

Does it indicate OFF?

YES -Go to step 5.

NO -Check for loose terminals in the VSA modulator-control unit 37P
connector. If necessary, substitute a known-good VSA modulator-control unit
(see VSA MODULATOR-CONTROL UNIT REMOVAL AND
INSTALLATION ), and retest.

5. Turn the ignition switch to LOCK (0).
6. Disconnect the parking brake switch 1P connector.
7. Turn the ignition switch ON (II).

2008 Honda Civic GX

2006-08 BRAKES VSA System - Civic (All Except Hybrid)