Heater Control Switch Circuit

AIR CONDITIONING: AIR CONDITIONING SYSTEM: Heater Control Switch Circuit
- Heater Control Switch Circuit

DESCRIPTION

The No. 1 heater control is powered through the A/C fuse. The No. 1 heater control transmits operational signals of each switch to the air conditioning amplifier.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. INSPECT FUSE (A/C)

(a) Remove the A/C fuse from the main body ECU.





(b) Measure the resistance according to the value(s) in the table below.

Standard resistance:





(c) Reinstall the A/C fuse.

NG -- REPLACE FUSE Locations
OK -- Continue to next step.

2. INSPECT NO. 1 HEATER CONTROL

(a) Remove the No. 1 heater control Disassembly.

(b) Measure the resistance.





(1) Measure the resistance according to the value(s) in the table below.

Standard resistance:





(c) Check that the indicator light comes on.

OK:





(d) Reinstall the No. 1 heater control.

NG -- REPLACE NO. 1 HEATER CONTROL Disassembly
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (NO. 1 HEATER CONTROL - BATTERY)

(a) Disconnect the G5 No. 1 heater control connector.





(b) Measure the voltage according to the value(s) in the table below.

Standard voltage:





(c) Reconnect the No. 1 heater control connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

4. CHECK HARNESS AND CONNECTOR (NO. 1 HEATER CONTROL - AIR CONDITIONING AMPLIFIER)

(a) Disconnect the G5 No. 1 heater control connector.





(b) Disconnect the G8 air conditioning amplifier connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard resistance:





(d) Reconnect the No. 1 heater control connector.

(e) Reconnect the air conditioning amplifier connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Symptom Related Diagnostic Procedures