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