GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1999 🢒 Astro - 2WD 🢒 Body and Accessories 🢒 Lighting Systems 🢒 Daytime Running Lamps (DRL) Headlamps Inoperative

Step

Action

Value(s)

Yes

No

1

Did you perform the DRL System Check?

--

Go to Step 2

Go to Daytime Running Lights (DRL) System Check

2
  1. Turn the ignition switch to the RUN position.
  2. Release the park brake.

Does the brake indicator lamp light?

--

Go to Hydraulic Brake Diagnostic System Check

Go to Step 3

3
  1. Turn the ignition switch to the LOCK position.
  2. Disconnect the daytime running lamps (DRL) module.
  3. Turn the ignition switch to the RUN position.
  4. Connect a test lamp J 35616-200 from the DRL module CKT 39 (PNK) cavity C, to ground.

Does the test lamp light?

--

Go to Step 4

Go to Step 11

4

Connect a test lampJ 35616-200 from DRL module CKT 39 (PNK) cavity C to CKT 750 (BLK) cavity H.

Does the test lamp light?

--

Go to Step 5

Go to Step 12

5
  1. Remove the DRL relay from the convenience center.
  2. Connect a test lamp from the DRL relay CKT 634 (YEL) cavity G3 to ground.

Does the test lamp light?

--

Go to Step 6

Go to Step 13

6

Connect a test lampJ 35616-200 from the DRL relay CKT 39 (PNK) cavity H3 to ground.

Does the test lamp light?

--

Go to Step 7

Go to Step 14

7
  1. Place the ignition switch in the OFF position.
  2. Use a test lamp J 35616-200 in order to test CKT 592 (LT GRN/BLK) for continuity between the DRL relay cavity G1 and the DRL module cavity G

Does the test lamp light?

--

Go to Step 8

Go to Step 15

8
  1. Reconnect the DRL relay.
  2. Place the ignition switch in the RUN position.
  3. Connect a fused jumper between CKT 592 (LT GRN/BLK) cavity G at the DRL module connector and ground.

Does the DRL operate?

--

Go to Step 9

Go to Step 17

9

Engage then disengage the parking brakes in order to check the operation of the brake warning indicator.

Does the brake warning indicator operate properly?

--

Go to Step 16

Go to Step 10

10
  1. Reconnect the diode.
  2. Use a test lamp J 35616-200 in order to backprobe the diode D300 connector cavity B to ground.

Does the test lamp light?

--

Go to Step 19

Go to Step 20

11

Repair the open in CKT 39 (PNK) between the instrument panel (IP) fuse block and the DRL module.

Is the repair complete?

--

Go to Daytime Running Lights (DRL) System Check

--

12

Repair the open in CKT 750 (BLK) between the DRL module and ground G206.

Is the repair complete?

--

Go to Daytime Running Lights (DRL) System Check

--

13
  1. Disconnect the diode D300 connector.
  2. Connect a test lampJ 35616-200 from diode D300 connector cavity A to ground.

Does the test lamp light?

--

Go to Step 10

Go to Step 18

14

Repair the open in CKT 39 (PNK) between splice S213 and the convenience center.

Is the repair complete?

--

Go to Daytime Running Lights (DRL) System Check

--

15

Repair the open in CKT 592 (LT GRN/BLK) between the DRL module and the DRL Relay.

Is the repair complete?

--

Go to Daytime Running Lights (DRL) System Check

--

16

Replace the DRL module. Refer to Daytime Running Lights (DRL) Control Module Replacement .

Is the repair complete?

--

Go to Daytime Running Lights (DRL) System Check

--

17

Replace the DRL relay. Refer to Daytime Running Lamps (DRL) Relay Replacement .

Is the repair complete?

--

Go to Daytime Running Lights (DRL) System Check

--

18

Repair the open in CKT 340 (ORN) between the IP fuse block and diode D300.

Is the repair complete?

--

Go to Daytime Running Lights (DRL) System Check

--

19

Repair the open in CKT 634 (YEL) between diode D300 and the convenience center.

Is the repair complete?

--

Go to Daytime Running Lights (DRL) System Check

--

20

Replace the DRL diode D300. Refer to Daytime Running Lamp (DRL) Diode Replacement .

Is the replacement complete?

--

Go to Daytime Running Lights (DRL) System Check

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