Inspection Procedure

WARNING: This page is about a different car, the 2007 Lexus RX 350. However, it is still accessible from the selected car via links, so may be relevant.

CHECK VEHICLE CONDITION

Check the vehicle condition.

VEHICLE CONDITION CHART

Condition	Proceed to
w/o Air Suspension System	A
w/ Air Suspension System	B

B: Go to step 6

A: Go to Next step

CHECK HARNESS AND CONNECTOR (HEIGHT CONTROL SENSOR SUB-ASSEMBLY REAR RH POWER SOURCE)

Disconnect the H26 connector from the height control sensor rear RH.

Measure the voltage according to the value(s) in the table below.

Fig 1: Identifying H26 Height Control Sensor Rear RH Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Voltage

TESTER CONNECTION SPECIFIED CONDITION

Tester connection	Condition	Specified condition
SHB (H26-3) - SHG (H26-1)	Ignition switch ON	4.5 to 5.5 V

NG: Go to step 5

OK: Go to Next step

INSPECT HEIGHT CONTROL SENSOR SUB-ASSEMBLY REAR RH

Connect 3 dry cell batteries (1.5 V) in a series.
Connect the positive (+) lead from the battery to terminal 1 and the negative (-) lead from the battery to terminal 3.

Measure the voltage between terminal 2 and terminal 3 when slowly moving the link up and down.

Voltage

VOLTAGE REFERENCE CHART

Link Angle	Standard voltage
+45°(High)	4.5 V
0°(Normal)	2.5 V
-45°(Low)	0.5 V

Fig 2: Inspecting Height Control Sensor Sub-Assembly Rear RH

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE HEIGHT CONTROL SENSOR SUB-ASSEMBLY REAR RH

OK: Go to Next step

CHECK HARNESS AND CONNECTOR (AFS ECU - HEIGHT CONTROL SENSOR SUB-ASSEMBLY REAR RH)

Disconnect the A14 connector from the AFS ECU.
Disconnect the H26 connector from the height control sensor sub-assembly rear RH.

Measure the resistance according to the value(s) in the following table.

Fig 3: Identifying H26 Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Resistance

TESTER CONNECTION SPECIFIED CONDITION

Tester connection	Condition	Specified condition
SHRL (A14-9) - SHRR (H26-2)	Always	Below 1 Ω
SHRL (A14-9) - Body ground	Always	10 kΩ or higher

Result

RESULT REFERENCE CHART

Condition	Proceed to
OK (When checking from the DTC)	A
OK (When checking from the PROBLEM SYMPTOMS TABLE)	B
NG	C

B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

C: REPAIR OR REPLACE HARNESS OR CONNECTOR

A: REPLACE AFS ECU

INSPECT AFS ECU

Measure the voltage according to the value(s) in the table below.

Fig 4: Inspecting A14 AFS ECU Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Voltage

TESTER CONNECTION SPECIFIED CONDITION

Tester connection	Condition	Specified condition
SBR (A14-10) - SGR (A14-20)	Ignition switch ON	4.5 to 5.5 V

Result

RESULT REFERENCE CHART

Condition	Proceed to
OK	A
NG (When checking from the DTC)	B
NG (When checking from the PROBLEM SYMPTOMS TABLE)	C

B: REPLACE AFS ECU

C: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

A: REPAIR OR REPLACE HARNESS OR CONNECTOR (AFS ECU - HEIGHT CONTROL SENSOR REAR RH)

CHECK DTC (AIR SUSPENSION SYSTEM)
1. Check the DTC of the air suspension system (See AIR SUSPENSION SYSTEM ).
  OK: Normal system code is output.
NG: GO TO appropriate FLOW CHART or PROBLEM SYMPTOMS TABLE .

OK: Go to Next step

CHECK HARNESS AND CONNECTOR (SUSPENSION CONTROL ECU HEIGHT SIGNAL POWER SOURCE)

Measure the voltage according to the value(s) in the table below.

Fig 5: Identifying S15 Suspension Control ECU Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Voltage

TESTER CONNECTION SPECIFIED CONDITION

Tester connection	Condition	Specified condition
SBL3 (S15-19) - SGL3 (S15-20)	Ignition switch ON	4.5 to 5.5 V

NG: Go to step 10

OK: Go to Next step

INSPECT SUSPENSION CONTROL ECU

Measure the voltage according to the value(s) in the table below.

Fig 6: Identifying S16 Suspension Control ECU Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Voltage

TESTER CONNECTION SPECIFIED CONDITION

Tester connection	Condition	Specified condition
SHR2 (S16-24) - Body ground	Ignition switch ON	0.5 to 4.5 V
SHF2 (S16-26) - Body ground	Ignition switch ON	0.5 to 4.5 V

NG: REPLACE SUSPENSION CONTROL ECU

OK: Go to Next step

CHECK HARNESS AND CONNECTOR (SUSPENSION CONTROL ECU - AFS ECU)

Disconnect the suspension control ECU connector and AFS ECU connector.

Measure the resistance according to the value(s) in the table below.

Fig 7: Disconnecting A14 And A15 AFS ECU Connector Terminals

Resistance

TESTER CONNECTION SPECIFIED CONDITION

Tester connection	Condition	Specified condition
SHRL (A14-9) - SHR2 (S16-24)	Always	Below 1 Ω
SGR (A14-20) - SGL3 (S15-20)	Always	Below 1 Ω
SBR (A14-10) - SBL3 (S15-19)	Always	Below 1 Ω
SHFL (A15-2) - SHF2 (S16-26)	Always	Below 1 Ω
SHRL (A14-9) - Body ground	Always	10 kΩ or higher
SGR (A14-20) - Body ground	Always	10 kΩ or higher
SBR (A14-10) - Body ground	Always	10 kΩ or higher
SHFL (A15-2) - Body ground	Always	10 kΩ or higher

Result

RESULT REFERENCE CHART

Condition	Proceed to
OK (When checking from the DTC)	A
OK (When checking from the PROBLEM SYMPTOMS TABLE)	B
NG	C

B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

C: REPAIR OR REPLACE HARNESS OR CONNECTOR

A: REPLACE AFS ECU

INSPECT AFS ECU

Measure the voltage according to the value(s) in the table below.

Fig 8: Identifying A14 AFS ECU Connector Terminals

Voltage

TESTER CONNECTION SPECIFIED CONDITION

Tester connection	Condition	Specified condition
SBR (A14-10) - SGR (A14-20)	Ignition switch ON	4.5 to 5.5 V

Result

RESULT REFERENCE CHART

Condition	Proceed to
OK	A
NG (When checking from the DTC)	B
NG (When checking from the PROBLEM SYMPTOMS TABLE)	C

B: REPLACE AFS ECU

C: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

A: REPAIR OR REPLACE HARNESS OR CONNECTOR (AFS ECU - SUSPENSION CONTROL ECU)