Heater Relay Circuit

AIR CONDITIONING: AIR CONDITIONING SYSTEM: Heater Relay Circuit

Heater Relay Circuit

DESCRIPTION

The heater relay is switched on by signals from the A/C amplifier. It supplies power to the blower motor.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. INSPECT FUSE (HEATER)
(a) Remove the HEATER fuse.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPLACE FUSE (HEATER)
OK -- Continue to next step.
2. INSPECT HEATER BLOWER MOTOR RELAY (HEATER)




(a) Remove the HEATER relay.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPLACE HEATER BLOWER MOTOR RELAY (HEATER)
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - BATTERY)




(a) Disconnect the connector from the A/C amplifier.
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE