AC/Air Conditioning — Inspection Procedure, page 59

AC–59
AIR CONDITIONING SYSTEM – TROUBLESHOOTING

INSPECTION PROCEDURE

1 Check voltage between terminal HR of A/C amplifier connector and body ground.

ON
Connect

P Remove the A/C amplifier with connectors still connected

C Measure voltage between terminals HR of A/C amplifier connector and body ground when ignition switch is ON and OFF.

OK
Ignition Switch          Voltage
OFF                      OV
ON     Blower ON         Below 1.O V
       Blower OFF        Battery positive voltage

BE3840
NO8781

NG

OK Proceed to next circuit inspection shown on matrix chart (See page AC–26).

2 Check heater relay.

C Check continuity between each pair of terminals of heater relay shown below.

OK
Terminals 4 and 5        No continuity
Terminals 1 and 3        Continuity
Terminals 2 and 4        Continuity

P
1. Apply battery positive voltage between terminals 1 and 3.
2. Check continuity between each pair of terminal shown below.

OK
Terminals 2 and 4        No continuity
Terminals 4 and 5        Continuity

BE1850 BE1844

OK

NG Replace heater relay.

3 Check HTR fuse.

OK

NG Check for short in all the harness and components to the HTR fuse (See attached wiring diagram).

Check and repair harness and connector between A/C amplifier and battery.