GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Isuzu 🢒 1999 🢒 Isuzu MD Steel Tilt (F Model) 🢒 Body and Accessories 🢒 Lighting Systems 🢒 Side Marker Lamps Inoperative

Step

Action

Value(s)

Yes

No

DEFINITION: The tractor marker lamps are inoperative.

1
  1. Set the headlamp switch to PARK.
  2. Remove the marker lamp relay.
  3. Connect a test lamp between terminal 30 in the taillamp relay socket and the chassis ground.

Is the test lamp lit?

--

Go to Step 2

Go to Step 3

2
  1. Disconnect the harness connector C 212.
  2. Connect a test lamp between terminal D 1 in C 212 the lower IP harness connector and the chassis ground.

Is the test lamp lit?

--

Go to Step 4

Go to Step 5

3

Repair the open in CKT 178 (GRN) between S289 and terminal 30 in the marker lamp relay socket.

Is the repair complete?

--

System OK

--

4
  1. Set the marker lamp switch to the ON position.
  2. Connect a J 39200 between terminals D 1 and D 2 in C 212 the upper IP harness connector.

Does the DMM indicate continuity?

--

Go to Step 6

Go to Step 19

5

Repair the open in CKT 175 (GRN) between S289 and terminal D 1 in C212 the lower IP harness connector.

Is the repair complete?

--

System OK

--

6
  1. Reconnect C212 the upper IP harness connector.
  2. Connect a test lamp between terminal 85 in the marker lamp relay socket and the chassis ground.

Is the test lamp lit?

--

Go to Step 7

Go to Step 8

7

Connect a test lamp between terminal 85 and terminal 86 in the marker lamp relay socket.

Is the test lamp lit?

--

Go to Step 9

Go to Step 10

8

Repair the open in CKT 176 (ORN) between terminal 85 in the marker lamp relay socket and terminal D 2 in C 212 the lower IP harness connector.

Is the repair complete?

--

System OK

--

9
  1. Disconnect C208 the harness connector.
  2. Connect a test lamp between terminal D and terminal E in the C 208 lower IP harness connector.
  3. Connect a jumper between terminal 30 and terminal 87 in the marker lamp relay socket.

Is the test lamp lit?

--

Go to Step 11

Go to Step 12

10

Repair the open CKT 22,CKT 179 or CKT 650 (BLK) between G 105 and terminal 86 in the marker lamp relay socket.

Is the repair complete?

--

System OK

--

11
  1. Remove the bulb from the right front ID lamp.
  2. Connect a jumper between terminal A and terminal B in the right front ID lamp bulb socket.
  3. Connect a J 39200 between terminal D and terminal E in the C 208 lower IP harness connector.

Does the DMM indicate continuity?

--

Go to Step 13

Go to Step 14

12
  1. Keep the jumper connected.
  2. Connect a test light between terminal E in the C208 of the lower IP harness connector and the chassis ground.

Is the test lamp lit?

--

Go to Step 15

Go to Step 16

13

Replace the marker lamp relay.

Is the repair complete?

--

System OK

--

14

Repair the open in Roof Harness CKT 5 (BRN) between the S 365 and C 208 terminal E, or the CKT 4 (BLK) between the S 371 and C 208 terminal D.

Is the repair complete?

--

System OK

--

15

Repair the open in CKT 22, CKT 25, CKT 69 or CKT 650 (BLK) between G 105 and terminal D in the C 208 of the lower IP harness connector.

Is the repair complete?

--

System OK

--

16
  1. Keep the jumper connected.
  2. Connect a test light between terminal 2 in the trailer connector and the chassis ground.

Is the test lamp lit?

--

Go to Step 17

Go to Step 18

17

Repair the open in CKT 177 (BRN) between S 378 and terminal E in the C 208 of the lower IP harness connector.

Is the repair complete?

--

System OK

--

18

Repair the open in CKT 177 (BRN) between S 378 and terminal 87 in the marker relay socket.

Is the repair complete?

--

System OK

--

19
  1. Keep the J 39200 connected.
  2. Disconnect the harness connector from the marker lamp switch.
  3. Connect a jumper between terminal 1 and terminal 2 in the upper IP harness marker lamp switch connector.

Does the DMM indicate continuity?

--

Go to Step 20

Go to Step 21

20

Replace the marker lamp switch.

Is the repair complete?

--

System OK

--

21

Connect a J 39200 between terminal D 1 in C 212 the upper IP harness connector and terminal 1 in the marker lamp switch connector.

Does the DMM indicate continuity?

--

Go to Step 22

Go to Step 23

22

Repair the open in CKT 112 (ORN) between terminal D 2 in C 212 the upper IP harness connector and terminal 2 in the marker lamp switch connector.

Is the repair complete?

--

System OK

--

23

Repair the open in CKT 111 (GRN) between terminal D 1 in C 212 the Upper IP Harness connector and terminal 1 in the marker lamp switch connector.

Is the repair complete?

--

System OK

--