Diesel Data: Automotive Repair

Illumination Circuit

ILLUMINATION CIRCUIT

CIRCUIT DESCRIPTION
When the light control switch is turned to TAIL or HEAD position, the T LP relay activates and power is supplied to the radio receiver assy and the multi display panel illumination. The body ECU determines the surrounding illumination intensity according to the illumination intensity detected by the automatic light control sensor and activates the T LP relay, allowing power to be supplied to the radio receiver assy and the multi display panel illumination.
Illumination intensity adjustment for the radio receiver assy and multi display panel illumination is performed with the rheostat switch.

HINT: If a problem exists in the automatic light control sensor, DTC B1244 is output.

Wiring Diagram:






Step 1 - 2:




Step 2 (Continued) - 3:




Step 3 (Continued) - 4:




Step 5:




INSPECTION PROCEDURE