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Test Description

WARNING: This page is about a different car, the 2004 Pontiac Sunfire and 2004 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table.

  1. 2:  DTC B2600 will disable the daytime running lights (DRL). If the DRLs are operational the code is not current. If DTC B2600 is not current, refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
  2. 3:  This condition indicates that there is a short to voltage in the headlamp high beam signal circuit or the headlamp low beam signal circuit.
  3. 4:  This step verifies normal headlamp operation.
  4. 7:  This step checks for battery positive voltage at the coil side of the DRL relay.
  5. 8:  This step verifies that the body control module (BCM) is providing ground to the coil side of the DRL relay.
DTC B2600

Step Action Yes No
Schematic Reference: Headlights/Daytime Running Lights (DRL) Schematics 
1 Did you perform the Lighting System Diagnostic System Check? Go to Step 2  Go to Diagnostic System Check - Lighting Systems 
2 
  1. Turn ON the ignition, with the engine OFF.
  2. With a scan tool, command the daytime running lights (DRL) ON.
Do the DRLs illuminate?		 Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems Go to Step 3 
3  Are the headlamps pulsing ON and OFF? Go to Step 14  Go to Step 4 
4 
  1. Place the headlamp switch in the HEADLAMP position.
  2. Place the headlamp dimmer switch in the HIGH position.
  3. Place the headlamp dimmer switch in the LOW position.
Do the headlamps operate properly?		 Go to Step 6  Go to Step 5 
5 Are both the high beam and low beam headlamps on one side inoperative? Go to Step 15  Go to Step 16 
6 With a scan tool, command the DRL relay ON and OFF.
Do you hear a click when you command the DRL relay ON and OFF?		 Go to Step 9  Go to Step 7 
7 
  1. Disconnect the DRL relay.
  2. Probe the battery positive voltage circuit of the DRL relay with a test lamp that is connected to a good ground.
Does the test lamp illuminate?		 Go to Step 8  Go to Step 17 
8 
  1. Connect a test lamp between the battery positive voltage circuit of the DRL relay's coil side and the DRL relay control circuit.
  2. With a scan tool, command the DRL relay ON.
Does the test lamp illuminate?		 Go to Step 12  Go to Step 11 
9 Test the ground circuit of the DRL relay for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 20  Go to Step 10 
10 Test the headlamp high beam signal circuit and the headlamp low beam signal circuit for an open or high resistance between the headlamp switch assembly and the body control module (BCM). Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 20  Go to Step 13 
11 Test the DRL relay control circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 20  Go to Step 13 
12 Inspect for poor connections at the DRL relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 20  Go to Step 18 
13 Inspect for poor connections at the harness connector of the body control module (BCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 20  Go to Step 19 
14 Repair the short to voltage in the headlamp high beam signal circuit or the headlamp low beam signal circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you complete the repair?		 Go to Step 20  -
15 Repair an open, high resistance, or short to ground in the supply voltage circuit of the inoperative headlamp. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you complete the repair?		 Go to Step 20  -
16 Repair an open or high resistance in the headlamp high beam signal circuit or the headlamp low beam signal circuit of the inoperative headlamp. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you complete the repair?		 Go to Step 20  -
17 Repair an open, high resistance, or short to ground in the battery positive voltage circuit of the DRL relay's coil side. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you complete the repair?		 Go to Step 20  -
18 Replace the DRL relay.
Did you complete the replacement?		 Go to Step 20  -
19
IMPORTANT: Perform the set up procedure for the body control module.
Replace the body control module. Refer to Body Control Module Replacement in Body Control System.Did you complete the replacement?		 Go to Step 20  -
20
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.
Does the DTC reset?		 Go to Step 2  System OK
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