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DI-756
DIAGNOSTICS - AIR CONDITIONING SYSTEM
DI3WC-07
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
J/B No. 3 J8 Passenger Side R/B No. 4 A/C Control Assembly
J/C
9 20 Front Heater Relay 2
B B G-R
3C 3C 4 4 A24 HR
R-L R-L 3 5
R-L 4 To
Driver Side J/B No. 1 4
1 2 Blower
4
3 HEATER 1 Motor
R-Y 4
1R 1K
AM1 2 W-B
1 2 A
1 B
1B 1K
J2
W-L J/C
A
I12
Ignition Switch
W
2 AM1 IG1 4 W-B
IK7 1
F8 FL Block
Engine Room J/B No. 2 HTR 6 B
2 2 INP
4 ALT
2L 2D
W 1 IJ
W
Battery FL MAIN
I21129
2001 SIENNA (RM787U)
Author : Date : 910
DI-757
DIAGNOSTICS - AIR CONDITIONING SYSTEM
INSPECTION PROCEDURE
1 Check voltage between terminal HR of A/C control assembly connector and body
ground.
PREPARATION:
ON HR Remove A/C control assembly with connectors still connected
(See page AC-1 16).
CHECK:
Measure voltage between terminal HR of A/C control assembly
and body ground when ignition switch is ON and OFF.
(-) (+) OK:
Ignition Switch Voltage
I20992
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-697 ).
NG
2001 SIENNA (RM787U)
Author : Date : 911
DI-758
DIAGNOSTICS - AIR CONDITIONING SYSTEM
2 Check front heater relay.
3 4 5 PREPARATION:
Remove front heater relay from passenger side R/B No. 4.
3 4 5 CHECK:
Check continuity between each pair of terminals of front heater
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 front heater relay.
OK
3 Check HEATER fuse
Driver Side J/B No. 1
PREPARATION:
Remove HEATER fuse from driver side J/B No. 1.
CHECK:
Check continuity of HEATER fuse.
OK:
Continuity exists.
HEATER NG Check for short in all the harness and compo-
I03208
nents connected to the HEATER fuse (See at-
tached wiring diagram).
OK
Check and repair harness and connector be-
tween A/C control assembly and battery.
2001 SIENNA (RM787U)
Author : Date : 912
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