GM Service Manual Online
For 1990-2009 cars only

Underhood Lamp Inoperative w/o Reel Lamp

Step

Action

Value(s)

Yes

No

1

Was the Exterior Lights System Check performed?

--

Go to Step 2

Go to Exterior Lights System Check

2

  1. Open the hood.
  2. Ensure that the lamp is correctly mounted.
  3. Remove the bulb from the underhood lamp.
  4. Connect a unpowered test lamp between the underhood lamp connector, cavity A for CKT 740 (ORN), and ground.

Does the test lamp light?

--

Go to Step 4

Go to Step 3

3

Repair the open in CKT 740 (ORN) between the underhood fuse-relay center and the underhood lamp connector.

Is the underhood lamp operative?

--

Go to Exterior Lights System Check

Go to Step 4

4

Connect a J 39200 DMM between the underhood lamp connector, cavity B for CKT 150 (BLK), and ground.

Does the test lamp light?

--

Go to Step 5

Go to Step 6

5

Replace the underhood lamp.

Is the underhood lamp operative?

--

Go to Exterior Lights System Check

Go to Step 6

6

Repair the open in CKT 150 (BLK) between the underhood lamp and ground G103.

Is the underhood lamp operative?

--

Go to Exterior Lights System Check

--

Underhood Lamp Inoperative w/ Reel Lamp

Step

Action

Value(s)

Yes

No

1

Was the Exterior Lights System Check performed?

--

Go to Step 2

Go to Exterior Lights System Check

2

  1. Open the hood.
  2. Ensure that the lamp is correctly mounted.
  3. Remove the bulb from the underhood lamp.
  4. Connect a unpowered test lamp between the underhood lamp connector, cavity A for CKT 740 (ORN), and ground.

Does the test lamp light?

--

Go to Step 4

Go to Step 3

3

Repair the open in CKT 740 (ORN) between the splice S148 and the underhood lamp connector.

Is the underhood lamp operative?

--

Go to Exterior Lights System Check

Go to Step 4

4

Connect a J 39200 DMM between the underhood lamp connector, cavity B for CKT 150 (BLK), and ground.

Is continuity present?

--

Go to Step 5

Go to Step 6

5

Replace the underhood lamp.

Is the underhood lamp operative?

--

Go to Exterior Lights System Check

Go to Step 6

6

Repair the open in CKT 150 (BLK) between the underhood lamp and splice S104.

Is the underhood lamp operative?

--

Go to Exterior Lights System Check

--