Page 985 of 4323
± DIAGNOSTICSAIR SUSPENSION SYSTEM
DI±783
977 Author: Date:
2005 SEQUOIA (RM1146U)
DTC U0122/67 Lost Communication with Translate ECU
CIRCUIT DESCRIPTION
The translate ECU sends signals such as vehicle wheel speed signal, TS terminal signal (test mode signal)
to the suspension control ECU, etc. when the air suspension system is in operation.
DTC No.DTC Detecting ConditionTrouble Area
U0122/67
The suspension control ECU detects the following conditions
simultaneously:
1. Ignition switch ON
2. No communication from translate ECU continues for more
than 3 seconds
Translate ECU
Suspension control ECU
Communication circuit
INSPECTION PROCEDURE
HINT:
This circuit uses CAN for communication. Therefore, if there are any malfunctions in the communication cir-
cuit, one or more DTCs in the CAN communication system is/are output.
1 Go to CAN communication system (See page DI±1065).
DIDEH±01
Page 986 of 4323
DI±784
± DIAGNOSTICSAIR SUSPENSION SYSTEM
978 Author: Date:
2005 SEQUOIA (RM1146U)
DTC U0132/71 Lost Communication with Ride Level Con-
trol Module
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
U0132/71
The suspension control ECU detects the following conditions
simultaneously:
1. Ignition switch ON
2. No communication from CAN bus continues for more than
10 times
Suspension control ECU
Communication circuit
INSPECTION PROCEDURE
HINT:
This circuit uses CAN for communication. Therefore, if there are any malfunctions in the communication cir-
cuit, one or more DTCs in the CAN communication system is/are output.
1 Go to CAN communication system (See page DI±1065).
DIDEJ±01
Page 987 of 4323
F19450
C6
Combination
MeterSuspension Control
ECU
I18
Ignition SW Instrument Panel J/B
Engine Room J/B24
14
15
16 LO
N
HIP
B±L
GR±R26
S25
9
S25
8
S25LO
NR
HI
6
IG2 AM25
W±R B±R IGN1 11
7 1H
1J1C
1C32
W±R
AM2
1
2C
2D1
B
Battery B±O
B 5 4F10
FL Block
± DIAGNOSTICSAIR SUSPENSION SYSTEM
DI±785
979 Author: Date:
2005 SEQUOIA (RM1146U)
Height Control Indicator Lamp Circuit
CIRCUIT DESCRIPTION
The height control indicator lamp indicates the target height, not the actual height.
It blinks when the height control is operated by pressing the height control switch and stays on when the
operation is completed.
WIRING DIAGRAM
DIDEL±01
Page 988 of 4323
DI±786
± DIAGNOSTICSAIR SUSPENSION SYSTEM
980 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Inspect height control indicator lamp.
PREPARATION:
Turn the ignition switch to the ON position.
CHECK:
Check that the height control indicator lamp comes on.
OK:
Height control indicator lamp comes on, and then goes off after 2 seconds.
NG Go to combination meter system
(See page DI±1610).
OK
Page 989 of 4323
I27705
Combination Meter Wire Harness View:
C6
C6±16
C6±15C6±14
F16805
Suspension Control ECU
Wire Harness View:
S25
NR HI
LO
± DIAGNOSTICSAIR SUSPENSION SYSTEM
DI±787
981 Author: Date:
2005 SEQUOIA (RM1146U)
2 Check harness and connector (Suspension control ECU ± Combination meter
assy).
PREPARATION:
Disconnect the suspension control ECU connector and the
combination meter connector.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester connection
(Symbol)ConditionSpecified condition
S25±8 (HI) ± C6±16AlwaysBelow 1 W
S25±9 (NR) ± C6±15AlwaysBelow 1 W
S25±26 (LO) ± C6±14AlwaysBelow 1 W
S25±8 (HI) ± Body groundAlways10 kW or higher
S25±9 (NR) ±
Body groundAlways10 kW or higher
S25±26 (LO) ±
Body groundAlways10 kW or higher
NG Repair or replace harness or connector.
OK
Page 990 of 4323
F16805
Suspension Control ECU
Wire Harness View:
S25
NR HI
LO
DI±788
± DIAGNOSTICSAIR SUSPENSION SYSTEM
982 Author: Date:
2005 SEQUOIA (RM1146U)
3 Check combination meter.
PREPARATION:
Reconnect the combination meter connector.
CHECK:
Measure the voltage according to the value(s) in the table be-
low.
OK:
Tester connection
(Symbol)ConditionSpecified condition
S25±8 (HI) ± Body groundIgnition switch ON10 to 14 V
S25±9 (NR) ±
Body groundIgnition switch ON10 to 14 V
S25±26 (LO) ±
Body groundIgnition switch ON10 to 14 V
NG Replace combination meter.
OK
Replace suspension control ECU
(See page IN±35).
Page 991 of 4323
F19451
C6
Combination
MeterSuspension Control
ECU
I18
Ignition SW
Engine Room J/B Instrument Panel J/B B±O
W±R11
7 1H
1JIGN1
1C
1C32
B±RMAN. 24
13 LG11
S25 VN
5
IG2 AM2 6
W±R
B
Battery 1
2D AM2
2C1
B5 4F10
FL Block
± DIAGNOSTICSAIR SUSPENSION SYSTEM
DI±789
983 Author: Date:
2005 SEQUOIA (RM1146U)
Height Control Manual Indicator Lamp Circuit
CIRCUIT DESCRIPTION
When manual mode is selected by pressing the height control mode select switch, the manual indicator lamp
comes on. (For the wiring diagram of the height control mode select switch circuit, see page DI±778.) If the
suspension control ECU detects a problem, the height control manual indicator lamp blinks while suspend-
ing the height control function. At the same time, the suspension control ECU records a DTC in the memory.
Connect terminals TC and CG of the DLC3 to make the height control manual indicator lamp blink and output
DTCs.
WIRING DIAGRAM
DIDEN±01
Page 992 of 4323
DI±790
± DIAGNOSTICSAIR SUSPENSION SYSTEM
984 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Inspect height control manual indicator lamp.
PREPARATION:
Turn the ignition switch to the ON position.
CHECK:
Check that the height control manual indicator lamp comes on.
OK:
Height control manual indicator lamp comes on, and then goes off after 2 seconds.
NG Go to combination meter
(See page DI±1610).
OK