I20985
SG
TPr
(-)
(+)
ON
DI-734
-
DIAGNOSTICS
AIR CONDITIONING SYSTEM
888
Author:
Date:
2001 SIENNA (RM787U)
INSPECTION PROCEDURE
1
Check voltage between terminals TPr and SG of A/C control assembly connec-
tor.
PREPARATION:
Remove A/C control assembly with connectors still connected.
CHECK:
(a)
Turn ignition switch ON.
(b)
Change the set temperature to activate the rear air mix
damper control servomotor, and measure the voltage be-
tween terminals TPr and SG of A/C control assembly con-
nector each time when the set temperature is changed.
OK:
Set Temperature
Voltage
Max. cool
3.5 - 4.5 V
Max. hot
0.5 - 1.5 V
HINT:
As the set temperature increases, the voltage decreases.
NG
Ok
Proceed to next circuit inspection shown on problem symptoms table (See page
er, if DTC 37 or 47 is displayed, check and replace A/C control assembly.
