AC/Air Conditioning — Inspection Procedure, page 29

AC–29
AIR CONDITIONING SYSTEM – TROUBLESHOOTING

INSPECTION PROCEDURE

1  Check voltage between terminals TR and SG of A/C amplifier connector.

ON
Connect

P  Remove A/C amplifier with connectors still connected.

C  1. Turn ignition switch ON.
   2. Measure voltage between terminal TR of SG of A/C amplifier connector at each temperature.

OK  Voltage:
     at 25˚C (77˚F):   1.8 ~ 2.2  V
     at 40˚C (104˚F):  1.2 ~ 1.6  V
HINT:  As the temperature increases, the voltage decreases gradually.

TR    SG
8E5840
N08793

NG

OK  Proceed to next circuit inspection shown on matrix chart (See page AC–26).  However, if the light is still blinking, check and replace A/C amplifier.

2  Check room temperature sensor.

Room Temp. Sensor

N08803

P  1. Remove instrument panel.
   2. Disconnect room temperature sensor connector.

C  Check resistance between terminals 1 and 2 of room temperature sensor connector.

OK  Resistance:
     at 25˚C (77˚F):   1.6 ~ 1.8 k

OK

NG  Replace room temperature sensor.

3  Check harness and connector between A/C amplifier and room temperature sensor (See page IN–30).

OK

NG  Repair or replace harness or connector.

Check and replace A/C amplifier.