GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2000 🢒 Tahoe Z71 🢒 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?

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Go to Step 2

Go to Daytime Running Lights (DRL) System Check

2
  1. Ensure that the park brake is not engaged.
  2. Turn the ignition switch to the RUN position.

Does the brake indicator lamp light?

--

Go to Step 12

Go to Step 3

3
  1. Turn the ignition switch to the LOCK position.
  2. Disconnect the daytime running lamps (DRL) module connector.
  3. Turn the ignition switch to the RUN position.
  4. Connect a test lamp from the DRL module connector, cavity C, to ground.

Does the test lamp light?

--

Go to Step 4

Go to Step 13

4

Connect a test lamp from cavity C to cavity H of the DRL module connector.

Does the test lamp light?

--

Go to Step 5

Go to Step 14

5
  1. Remove the DRL relay from the convenience center.
  2. Connect a test lamp the DRL relay, cavity G6, to ground.

Does the test lamp light?

--

Go to Step 6

Go to Step 15

6

Connect a test lamp from the DRL relay, cavity G4, to ground.

Does the test lamp light?

--

Go to Step 7

Go to Step 16

7
  1. Turn the ignition switch to the LOCK position.
  2. Reconnect the DRL module connector.
  3. Turn the ignition switch to the RUN position.

Does the DRL indicator lamp light?

--

Go to Step 8

Go to Step 17

8
  1. Connect a DMM from the DRL relay, cavity H6, to B+.
  2. Measure the voltage.

Is there batery voltage?

Battery Voltage

Go to Step 9

Go to Step 18

9

Connect a fused jumper from cavity G6 to cavity H4 of the DRL relay.

Do the low beam headlights light?

--

Go to Step 19

Go to Step 10

10
  1. Re-install the DRL relay.
  2. Turn the ignition switch to the RUN position.
  3. Disconnect the headlamp connector.
  4. Connect a test lamp from cavity C (base) or cavity A (quad) to ground.

Does the test lamp light?

--

Go to Step 11

Go to Step 20

11

Connect a DMM, set on ohms, between cavity A and ground.

Is there continuity?

--

Go to Step 21

Go to Step 22

12

Refer to Park Brake System Check for diagnosis.

Did you find and correct the condition?

--

Go to Daytime Running Lights (DRL) System Check

--

13

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

--

14

Repair the open in CKT 150 (BLK) between the DRL module and ground G200. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Daytime Running Lights (DRL) System Check

--

15
  1. Inspect for an open in CKT 340 (ORN) between the IP fuse block and D203.
  2. If an open is not found, inspect for an open in CKT 634 (YEL) between D203 and the convenience center.
  3. If an open is not found, locate and replace diode D203.

Is the repair complete?

--

Go to Daytime Running Lights (DRL) System Check

--

16

Repair the open in CKT 39 (PNK) between splice S213 and the convenience center. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Daytime Running Lights (DRL) System Check

--

17
  1. Inspect for a poor connection or damaged terminals at the DRL module connector.
  2. Repair the DRL module connector, as necessary.
  3. If you do not find a condition at the connector, replace the DRL module.

Is the repair complete?

--

Go to Daytime Running Lights (DRL) System Check

--

18

Repair the open in CKT 592 (LT GRN/BLK) between the DRL module and the convenience center. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Daytime Running Lights (DRL) System Check

--

19

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

Is the repair complete?

--

Go to Daytime Running Lights (DRL) System Check

--

20

Repair the open in CKT 12 (TAN) between the DRL relay and left high/low beam headlamps.

Is the repair complete?

--

Go to Daytime Running Lights (DRL) System Check

--

21

Replace the left and/or the right high/low beam headlamp. Refer to Headlamp Replacement .

Is the repair complete?

--

Go to Daytime Running Lights (DRL) System Check

--

22

Repair the open in CKT 150 between the left high/low beam headlamp and ground G113, and/or repair the open in CKT 250 (BLK) between the right high/low beam headlamp and ground G112.

Is the repair complete?

--

Go to Daytime Running Lights (DRL) System Check

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