B2600

DTC B2600

Circuit Description

The daytime running lamps (DRL) are controlled by the body control module (BCM). The BCM grounds the DRL relay control circuit in order to energize the DRL relay coil. This action places the right and left headlamps in series with each other with the DRL relay providing the ground path and the RT HDLP fuse providing battery positive voltage. The BCM monitors the low and high beam circuits to ensure that the DRLs are operating properly. If the BCM senses that the DRLs are not operating properly, DTC B2600 is set.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B2600 Daytime Running Lamp Control System Circuit

Conditions for Running the DTCs

* The headlamp switch is OFF.
* The park brake is unapplied.
* The transaxle is in gear.

Conditions for Setting the DTC

One or more of the following conditions are present:

* The DRL relay control circuit is open.
* The DRL relay output circuit is open.
* The right headlamp power battery positive voltage circuit is open.
* The left headlamp power battery circuit is open.
* The DRL relay ground circuit is open.

Action Taken When the DTC Sets

* The BCM turns off the DRL relay control for the remainder of the ignition cycle.
* The SERVICE indicator lights.

Conditions for Clearing the DTC

* The conditions for setting the DTC are no longer present.
* A history DTC clears after 100 malfunction-free ignition cycles.
* The BCM receives the clear code command from the scan tool.

Diagnostic Aids

* Check both the LH and RH headlamps for proper operation.
* Check both the LH and RH HDLP fuses.
* Diagnose all other DRL DTCs before DTC B2600.
* If the DTC is a history DTC, the problem may be intermittent. Refer to Testing for Intermittent Conditions and Poor Connections. Component Tests and General Diagnostics

Test Description

Step 1 - Step 11:

The number below refers to the step number on the diagnostic table.
2. Listen for an audible click when the DRL relay operates. Command both the ON and OFF states. Repeat the commands as necessary.