Diesel Data: Automotive Repair

Blower Motor Circuit

BLOWER MOTOR CIRCUIT

CIRCUIT DESCRIPTION




The blower motor is operated by signals from the A/C amplifier. Blower motor speed signals are transmitted by changes in the Duty Ratio.

Duty Ratio
The duty ratio is the ratio of the period of continuity in one cycle.
For example, A is the period of continuity in one cycle, then B is the period of non-continuity.

Wiring Diagram:






Step 1 - 3:




Step 4 - 6:




INSPECTION PROCEDURE