Lexus ES300 (2002 year). Manual — part 346
F41654
SW1
SW2
A22
21
20
Y
V
IF2
5
4
1
3
ECU1
ECU2
GND
2
W-B
3B
70
SB
IA
8
2R
2L
Driver Side J/B
Passenger Side J/B
A23
Absorber Control SW
Absorber Control ECU
A22
IF2
Y
W-B
3B
Y
20
8
-
DIAGNOSTICS
ELECTRONIC MODULATED SUSPENSION SYSTEM
05-227
380
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
DTC
C1787/87 ABSORBER CONTROL SWITCH CIRCUIT
CIRCUIT DESCRIPTION
The absorber control switch is a switch which selects the damping force mode of shock absorber.
DTC No.
DTC Detecting Condition
Trouble Area
C1787/87
Absorber control switch signal does not change.
Absorber control switch
Absorber control switch circuit
Absorber control ECU
WIRING DIAGRAM
056AH-01
W04329
C66870
F41636
GND
ECU2
ECU1
SPORT
SEMI-SPOR T
SEMI-COMFOR T
COMFORT
05-228
-
DIAGNOSTICS
ELECTRONIC MODULATED SUSPENSION SYSTEM
381
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
INSPECTION PROCEDURE
HINT:
Start the inspection from the step 1 in case of using hand-held tester and start from step 2 in case of not
using hand-held tester.
1
READ VALUE OF HAND-HELD TESTER
(a)
Connect the hand-held tester to the DLC3.
(b)
Turn the ignition switch ON and turn the hand-held tester main switch ON.
(c)
Select the item ”DAMPER SW1 (SW2)” in the DATA LIST and read its value displayed on the hand-
held tester.
(d)
Check that the acceleration value of the acceleration sensor observed in the hand-held tester is
changing when the vehicle is bounced.
OK:
Absorber control switch value must be changing.
NG
CHECK AND REPLACE ABSORBER CONTROL
ECU(See page
OK
2
INSPECT ABSORBER CONTROL SWITCH
(a)
Disconnect the absorber control switch.
(b)
Check the continuity between each terminal of the ab-
sorber control switch at each switch position.
OK:
Absorber control switch ”SPORT” position:
Terminal No. (Terminal name)
Specification
1 (ECU1) - 2 (GND) - 3 (ECU2)
No continuity
Absorber control switch ”SEMI-SPORT” position:
Terminal No. (Terminal name)
Specification
2 (GND) - 3 (ECU2)
Continuity
Absorber control switch ”SEMI-COMFORT” position:
Terminal No. (Terminal name)
Specification
1 (ECU1) - 2 (GND) - 3 (ECU2)
Continuity
Absorber control switch ”COMFORT” position:
Terminal No. (Terminal name)
Specification
1 (ECU1) - 2 (GND)
Continuity
NG
REPLACE ABSORBER CONTROL SWITCH
OK
-
DIAGNOSTICS
ELECTRONIC MODULATED SUSPENSION SYSTEM
05-229
382
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
3
CHECK HARNESS AND CONNECTOR(ABSORBER CONTROL SWITCH -
ABSORBER CONTROL ECU)
(a)
Check for open and short circuit in harness and connector between absorber control switch and ab-
sorber control ECU (See page
NG
REPAIR OR REPLACE HARNESS OR
CONNECTOR
OK
CHECK AND REPLACE ABSORBER CONTROL ECU(See page
F41655
Absorber Control ECU
Passenger Side J/B
D2 DLC3
Driver Side J/B
Tc
P-B
6
A22
2
IF2
2R
2L
8
W-B
IA
SB
(*1)
3B
11
51
71
(*2)
50
70
60
80
13
4
Tc
CG
*1: w/ VSC
*2: w/o VSC
3B
3B
3B
3B
3B
3B
(*2)
(*1)
(*2)
(*1)
(*1)
P-B
P-B
W-B
8
05-230
-
DIAGNOSTICS
ELECTRONIC MODULATED SUSPENSION SYSTEM
383
2002 LEXUS ES300 REPAIR MANUAL (RM911U)
TC TERMINAL CIRCUIT
CIRCUIT DESCRIPTION
Making short circuit between terminal Tc and CG of DLC3 will output DTC from the TEM terminal of DLC3.
WIRING DIAGRAM
056AI-01
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