Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota 4Runner 1996-2003 Approved SIL techinfo.toyota.com ileaf 02toyrm 02toypdf 02rmsour 2002 024runne di acsy heaterma
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DI-627
DIAGNOSTICS - AIR CONDITIONING SYSTEM
DI3WC-17
Heater Main Relay Circuit
CIRCUIT DESCRIPTION
The heater main relay is switched on by signals from the A/C control assembly. It supplies power to the blow-
er motor.
WIRING DIAGRAM
Engine Room R/B
ALT HEATER R From GAUGE Fuse A/C Amplifier
2 2
1 2 1 2
R-L
W
2 2
1 5
Heater
Battery
Relay
4
2 Engine Room R/B
W-B
2 3
A
J/C 2 2 11 10
J1 IG1 A31 HR
L-R Y-R Y-R
A
W-B
Blower Motor
EB
I21904
2002 4RUNNER (RM887U)
Author : Date : 803
DI-628
DIAGNOSTICS - AIR CONDITIONING SYSTEM
INSPECTION PROCEDURE
1 Check voltage between terminal HR of A/C control assembly connector and body
ground.
PREPARATION:
Remove A/C control assembly with connectors still connected
(-)
(See page AC-84 ).
CHECK:
HR(+)
Measure voltage between terminal HR of A/C control assembly
and body ground when ignition switch is ON and OFF.
OK:
Ignition Switch Voltage
I00347
OFF 0V
Blower ON 0V
ON
Blower OFF 10 - 14 V
OK Proceed to next circuit inspection shown on
problem symptoms table (See page DI-586 ).
NG
2002 4RUNNER (RM887U)
Author : Date : 804
DI-629
DIAGNOSTICS - AIR CONDITIONING SYSTEM
2 Check heater main relay.
3 4 5 PREPARATION:
Remove heater main relay from No. 2 R/B.
3 4 5 CHECK:
Check continuity between each pair of terminals of heater main
relay shown below.
OK:
1 2 Tester connection Specified condition
1 2 1-4 No continuity
BE1850 BE1844 I00312
2-4 Continuity
3-5 62.5 - 90.9
PREPARATION:
Apply battery positive voltage between terminals 3 and 5.
CHECK:
Check continuity between each pair of terminal shown below.
OK:
Tester connection Specified condition
1-2 Continuity
2-4 No continuity
NG Replace hater main relay.
OK
3 Check HEATER fuse
PREPARATION:
No. 2 R/B
Remove HEATER fuse from No. 2 R/B.
CHECK:
Check continuity of HEATER fuse.
OK:
Continuity exists.
NG Check for short in all the harness and compo-
HEATER Fuse nents connected to the HEATER fuse (See at-
I09497
tached wiring diagram).
OK
Check and repair harness and connector be-
tween A/C control assembly and battery.
2002 4RUNNER (RM887U)
Author : Date : 805
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