Diagnostic Aids
WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
- The low beam headlamps must operate correctly or DTC B2600 may result.
- Check both the LH and RH headlamps for proper operation.
- Check both the LT HEADLAMP and RT HEADLAMP fuses.
- If the DTC is a history DTC, the problem may be intermittent. Refer to Testing for Intermittent Conditions and Poor Connections .
DTC B2600
| Step | Action | Values | Yes | No |
|---|---|---|---|---|
| Schematic Reference: Headlights/Daytime Running Lights (DRL) Schematics | ||||
| 1 | Did you perform the Diagnostic System Check - Vehicle? | - | Go to Step 2 | Go to Diagnostic System Check - Vehicle |
| 2 |
|
- | Go to Step 4 | Go to Step 3 |
| 3 | Are both the high beam and low beam headlamps on one side inoperative? | - | Go to Step 12 | Go to Step 13 |
| 4 |
|
0.4 to 1.0 Ω | Go to Step 5 | Go to Step 6 |
| 5 | Test the DRL relay for continuity between the coil sides of the relay. Is continuity present? |
- | Go to Step 8 | Go to Step 11 |
| 6 |
|
Less than 1 Ω | Go to Step 7 | Go to Step 14 |
| 7 | Test the DRL resistor supply voltage circuit for an open or high resistance. Did you find and correct the condition? |
- | Go to Step 18 | Go to Step 10 |
| 8 | Test the headlamp high beam signal circuit and the headlamp low beam signal circuit for an open or high resistance between the body control module (BCM) and the underhood junction block. Refer to Circuit Testing
and Wiring Repairs
. Did you find and correct the condition? |
- | Go to Step 18 | Go to Step 9 |
| 9 | Inspect for poor connections at the harness connector of the BCM. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
. Did you find and correct the condition? |
- | Go to Step 18 | Go to Step 17 |
| 10 | Inspect for poor connections at the harness connector of the DRL resistor. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
. Did you find and correct the condition? |
- | Go to Step 18 | Go to Step 15 |
| 11 | Inspect for poor connections at the DRL relay. Refer to Testing for Intermittent Conditions and Poor Connections
and Connector Repairs
. Did you find and correct the condition? |
- | Go to Step 18 | Go to Step 16 |
| 12 | 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
. Did you complete the repair? |
- | Go to Step 18 | - |
| 13 | 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
. Did you complete the repair? |
- | Go to Step 18 | - |
| 14 | Repair an open or high resistance in the ground circuit of the DRL resistor. Refer to Circuit Testing
and Wiring Repairs
. Did you complete the repair? |
- | Go to Step 18 | - |
| 15 | Replace the DRL resistor. Did you complete the replacement? |
- | Go to Step 18 | - |
| 16 | Replace the DRL relay. Refer to Relay Replacement (Attached to Wire Harness)
or Relay Replacement (Within an Electrical Center)
. Did you complete the replacement? |
- | Go to Step 18 | - |
| 17 | Replace the BCM. Refer to Control Module References
for replacement, setup, and programming. Did you complete the replacement? |
- | Go to Step 18 | - |
| 18 |
|
- | Go to Step 2 | System OK |