Diagnosis Procedure

THERMO CONTROL AMPLIFIER


Description


COMPONENT DESCRIPTION





- Thermo control amp. (1) is composed of thermistor and amplifier.
Thermistor is installed on evaporator, and amplifier is attached to foot duct (left).
- When the thermistor detecting temperature which passing through evaporator is extremely low, thermo control amp. sends the thermo control amp. OFF signal to BCM, and stops the compressor.

OPERATING RATE CONTROL
- Thermo control amp. detects the positions of air temperature control dial and MODE dial.
- Thermo control amp. corrects the stopping temperature of A/C compressor depending on the condition of A/C operation, and prevents too much heating by turning thermo control amp. ON to OFF.





THERMO CONTROL AMPLIFIER


Diagnosis Procedure

1.CHECK FUSE
Check 10A fuse [NO. 16, located in the fuse block (J/B)].

NOTE:
Diagrams.
Is inspection result normal?
YES - GO TO 2.
NO - Replace fuse after repairing the applicable circuit.
2.CHECK THERMO CONTROL AMP. POWER SUPPLY CIRCUIT
1. Turn the ignition switch OFF.
2. Disconnect the thermo control amp. connector.
3. Turn the ignition switch ON.
4. Check voltage between thermo control amp. harness connector and the ground.





Is inspection result normal?
YES - GO TO 3.
NO - Repair the harness or connector between thermo control amp. and fuse.
3.CHECK CONTINUITY THERMO CONTROL AMP. GROUND CIRCUIT
1. Turn the ignition switch OFF.
2. Check continuity between thermo control amp. harness connector and the ground.





Is inspection result normal?
YES - GO TO 4.
NO - Repair the harnesses or connectors.
4.CHECK VOLTAGE BETWEEN THERMO CONTROL AMP. AND GROUND
1. Turn the ignition switch ON.
2. Check voltage between thermo control amp. harness connector and the ground.





Is inspection result normal?
YES - Replace the thermo control amp.
NO - GO TO 5.
5.CHECK CONTINUITY BETWEEN THERMO CONTROL AMP. AND BCM
1. Turn the ignition switch OFF.
2. Disconnect the BCM connector.
3. Check continuity between thermo control amp. harness connector and BCM harness connector.





Is inspection result normal?
YES - GO TO 6.
NO - Repair the harnesses or connectors.
6.CHECK CONTINUITY BETWEEN THERMO CONTROL AMP. AND GROUND
Check continuity between thermo control amp. harness connector and the ground.





Is inspection result normal?
YES - Repair the harnesses or connectors.
NO - INSPECTION END