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
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:

(d) Reinstall the No. 1 heater control.
NG -- REPLACE NO. 1 HEATER CONTROL
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