Inspection Procedure

WARNING: This page is about a different car, the 2009 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT REAR HEIGHT CONTROL SENSOR

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

Fig 1: Inspecting Rear Height Control Sensor

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Measure the voltage between terminals 1 (SHG) and 2 (SHRL) when slowly moving the link up and down.

Standard voltage

REAR HEIGHT CONTROL SENSOR LINK ANGLE

Link Angle	Specified Condition
+45° (High)	Approx. 4.5 V
0° (Normal)	Approx. 2.5 V
-45° (Low)	Approx. 0.5 V

NG : REPLACE REAR HEIGHT CONTROL SENSOR

OK : GO TO NEXT STEP

CHECK WIRE HARNESS (SENSOR - ECU)

Disconnect the H18 sensor connector.
Disconnect the H12 ECU connector.

Fig 2: Checking Wire Harness (Sensor - ECU)

Measure the resistance of the wire harness side connectors.

Standard resistance

TESTER CONNECTION - SPECIFIED CONDITION

Tester Connection	Specified Condition
H12-20 (SGR) - H18-1 (SHG)	Below 1Ω
H12-5 (SHR) - H18-2 (SHRL)
H12-2 (SBR) - H18-3 (SHB)
H18-1 (SHG) - Body ground	10 kΩ or higher
H18-2 (SHRL) - Body ground
H18-3 (SHB) - Body ground

NG : REPAIR OR REPLACE HARNESS AND CONNECTOR

OK : PROCEED TO NEXT INSPECTION PROCEDURE SHOWN IN PROBLEM SYMPTOMS TABLE