Opel Frontera UBS. Service manual — part 729

8D – 346 WIRING SYSTEM

Parts Location (RHD)

Legend

(1) H-48
(2) B-2
(3) G-7
(4) Rear Defogger
(5) G-3
(6) H-37
(7) R-3
(8) H-31

(9) B-26

(10) Fuse Box
(11) B-38
(12) B-18
(13) H-25
(14) Starter Switch
(15) I-17 (Rear Defogger Switch)
(16) B-6, B-7 (Alarm and Relay Control Unit)

D08RW810

9

8

7

6

5

4

3

2

1

16

15

14

13

12

11

10

WIRING SYSTEM 8D – 347

Diagnosis

Quick Chart for Check Points

Check point

Fuse

C-4

(10A)

C-17

(25A)

Rear

defogger

relay

Alarm &

relay

control

unit

Cable

harness

1

Rear defogger does not operate

Trouble mode

2

Rear defogger timer does not function

Rear

defogger

SW

8D – 348 WIRING SYSTEM

1 Rear Defogger Does Not Operate

•

IS THE REAR DEFOGGER SWITCH NORMAL?

YES

YES

REPLACE THE FUSE

NO

NO

•

ARE THE FUSES C-4 (10A) AND C-17
(25A) NORMAL?

•

IS THE REAR DEFOGGER RELAY NORMAL?

REPLACE THE RELAY

YES

NO

TURN ON THE STARTER SWITCH AND THE REAR DEFOGGER
SWITCH

YES

NO

•

GROUND IT SECURELY

YES

NO

•

IS R-3 GROUNDED SECURELY?

REPAIR OR REPLACE THE SWITCH

IS THERE A BATTERY VOLTAGE APPLIED BETWEEN THE REAR
DEFOGGER CONNECTOR 1 G-3 AND THE GROUND?

•

YES

REPAIR A POOR CONNECTION AT THE
CONNECTORS OR AN OPEN CIRCUIT IN
EACH OF THE FOLLOWING
CONNECTIONS: FUSE C-17 (25A) AND
2 B-38 , FUSE C-4 (10A) AND 3 B-38 ,
4 B-38 AND 1 G-3 , 4 I-17
AND 8 B-6 , 5 I-17 AND FUSE C-4 (10A)

NO

•

IS THERE CONTINUITY BETWEEN 1 G-7
AND THE GROUND?

REPLACE THE ALARM & RELAY CONTROL
UNIT

REPAIR A POOR CONNECTION AT THE
CONNECTORS
OR AN OPEN CIRCUIT BETWEEN 1 G-7
AND R-3

WIRING SYSTEM 8D – 349

2 Rear Defogger Timer Does Not Function

REPLACE THE ALARM & RELAY CONTROL UNIT