Circuit Description
This is a trouble code (both current and history) that indicates a system problem has occurred that is preventing the DRL function from performing properly.
Conditions for Setting the DTC
All of the following conditions must be met:
| • | The ambient light sensor indicates a bright condition. |
| • | The DRL is configured to have a drop resistor. |
| • | Ignition 3 is active. |
| • | The DRL relay output is active. |
| • | The low beams are not in the DRL range OR that the high beams are in the ON state for more than 10 DRL relay ON/OFF cycles. |
Action Taken When the DTC Sets
| • | In bright conditions the low beams will flicker or are off. |
| • | Turns OFF the DRL relay |
| • | Enters a fault state |
| • | Stores DTC B2600 in the BCM |
Conditions for Clearing the DTC
| • | The fault state is exited upon ignition 3 becoming inactive. |
| • | All the BCM history codes will be cleared after 100 ignition cycles (from OFF to RUN) with no current codes active during the 100 ignition cycles. |
| • | Use the scan tool. |
Diagnostic Aids
| • | All other DRL DTCs must be diagnosed before DTC B2600. |
| • | When the diagnostics directs you to take electrical measurements at the wiring harness junction blocks, refer to Power Distribution for the terminal assignments of the wiring harness junction blocks. |
| • | If the DTC is a history DTC, the problem may be intermittent. Perform the above tests while wiggling the wiring and connectors. This may often cause the malfunction to appear. |
Test Description
The numbers below refer to the numbers on the diagnostic table.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: Headlights/Daytime Running Lights (DRL) Schematics Important: A short to ground will cause an open fuse(s). Before performing this diagnostic procedure, inspect the fuse(s) for an open. | ||||
1 | Was the BCM System Check performed? | -- | Go to Step 2 | |
2 | Are there any other DRL DTCs present? | -- | Go to Step 3 | Go to Step 4 |
3 | Repair all other DRL DTCs. Is the repair complete? | -- | Go to Step 5 | Go to Step 4 |
Clear the DTCs from the memory. Is DTC 2600 still current? | -- | Go to Daytime Running Lamps (DRL) Inoperative, Headlamp Switch Operates Normally | ||
5 | Clear the DTCs from the memory. Are the DTCs cleared from the memory? | -- | -- | |
