GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Isuzu 🢒 1999 🢒 Isuzu MD Steel Tilt (F Model) 🢒 Body and Accessories 🢒 Lighting Systems 🢒 Dome Lamps Inoperative with Left Front Door Open

Step

Action

Value(s)

Yes

No

1
  1. Disconnect the dome lamp harness connector.
  2. Connect a test lamp between terminal C and terminal B in the dome lamp connector.

Does the test lamp light?

--

Go to Step 2

Go to Step 3

2

Replace the dome lamp assembly.

Does the dome lamp operate when the door is open?

--

System OK

--

3
  1. Do not disconnect the test lamp. Remove diode module D202 from joint connector 1 (upper).
  2. Connect a jumper between terminal 1J and terminal 1H in the joint connector socket.

Does the test lamp light?

--

Go to Step 4

Go to Step 5

4

Replace diode module D202.

Does the dome lamp operate when the door is open?

--

System OK

--

5
  1. Do not disconnect the test lamp or the jumper. Disconnect the harness connector from the door switch.
  2. Connect a jumper between the door switch connector and chassis ground.

Does the test lamp light?

--

Go to Step 6

Go to Step 7

6

Replace the door jamb switch.

Does the dome lamp operate when the door is open?

--

System OK

--

7

Locate and repair the open in one or more of the following circuits between the dome lamp switch and the door switch:

    • CKT 2 (RED/YEL)
    • CKT 149 (RED/YEL)
    • CKT 26 (RED/BLK)
    • CKT 148 (RED/BLK)

Does the dome lamp operate when the door is open?

--

System OK

--