Toyota Land Cruiser 1988 Repair Manual page 313

BE-8
Problem
Blower does not work
when fan switch on
Incorrect temperature
output
Circuit Braker
f''~
HI
\\\
REAR
LO
Ignition
Switch
5 4
BODY ELECTRICAL SYSTEM -Rear Heater
REAR HEATER
Troubleshooting
Possible cause Remedy
Heater relay faulty Check relay
Heater blower switch faulty Check switch
Heater blower resistor faulty Check resistor
Heater blower motor faulty Replace motor
Wiring or ground faulty Repair as necessary
Heater hose leaking or clogged
Replace hose
Heater radiator leaking or Replace radiator
clogged
Wiring Diagram
Rear Heater
Relay
Rear Heater
Switch
Rear Heater
Rear Heater Blower Switch
INSPECT SWITCH CONTINUITY
Page
BE-8
BE-8
BE-9
BE2059
Inspect the switch continuity between terminals.
BE2060 GA·4·2
AC0503
'\ Terminal
1 2 3 4
Switch position \
HI
0
1"\
-o
'-'
OFF
LO
0 1"\ D
~
If continuity is not as specified, replace the switch.
Rear Heater Relay
1. INSPECT RELAY CONTINUITY
(a) Check that there is continuity between terminals 1
and 3.
(b) Check that there is continuity between terminals 2
and
5.
(c) Check that there is no continuity between terminals
1 and 4.
If continuity is not as specified, replace the relay.