Blower Ground-Side Switching Circuit Test

Heater System Electrical Wiring Diagram And Continuity Test:

Heater Electrical Wiring Circuit:

Blower Switch Chart/Terminal Location And Testing Procedure:

NOTE: Amperage readings, on the blower motor circuit, will increase as the blower speed is increased. This is the same as on previous supply switching circuits or previous model vehicles.

Voltage readings across line 261 and line 57, on the blower ground side switching circuits, decrease instead of increasing as the blower speed increases. Line 249 to line 57 will always read the same voltage as battery voltage. A maximum blower speed switch position will produce a zero voltage reading across line 261 and line 57, as a result of the blower switch bypassing the resistor assembly and connecting to the blower switch ground line 57.