Daytime Running Lamp Control Unit: Testing and Inspection

Electronic Combination Flasher Circuit:

Electronic Combination Flasher With DRL Circuit:

The battery input (Pin 1), is brought into the Junction Block through the Electrical Distribution Wiring (EDW) harness. It originates under the hood in the Power Distribution Center (PDC) through a 20 ampere fuse at position 10 (9th position from the upper end) and labeled HAZARD. This circuit (L09) is the only power feed to the combination-flasher/ DRL.

Junction Block Terminal Call-Out:

Junction Block Terminal Call-Out With DRL:

The ignition input of Pin 6 (refer to Junction Block Terminal Call-Out and Junction Block Terminal Call-Out with DRL tables) only senses that the ignition circuit is ON and does not supply current to the module in a way that would power the system. This RUN/START circuit is brought into the junction block to a 10 ampere fuse labeled TS BU LMP at the bottom right side. The circuit designation out of the fuse is A22D. This circuit feeds the combo-flasher and the following systems with Ignition voltage if the vehicle is so equipped:
- Back-Up Lamps
- Electrochromic Inside Rear view Mirror
- A/C Control Head
- Mini-Trip Computer
- ABS Module
- Front Blower Relay Coil
- Rear Blower Relay Coil
- AWD Solenoids
- Rear Window Defogger (EBL) Relay Coil The ignition input to the combo-flasher will draw typically 5 mA of current while active.

Combination Flasher Diagnosis (Part 1 Of 2):

Combination Flasher Diagnosis (Part 2 Of 2):

Combination Flasher Diagnosis With DRL (Part 1 Of 3):

Combination Flasher Diagnosis With DRL (Part 2 Of 3):

Combination Flasher Diagnosis With DRL (Part 3 Of 3):

For diagnostic test procedures, refer to Combination Flasher Diagnosis tables.