DTC B241A: Rear Height Control Sensor: Procedure

1. Clear the DTCs. Refer to DTC CHECK / CLEAR .
2. Check for DTCs. Refer to DTC CHECK / CLEAR .

   OK

   DTC B241A is not output.

NG → See step   2 

OK → See step   10 

1. Check the vehicle condition.

   Result

   Result	Proceed to
   w/o Advanced Parking Guidance System	A
   w/ Advanced Parking Guidance System	B

B → See step   6 

A: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / HL Auto Leveling / Data List.
5. Read the display on the Techstream.
   HL AUTO LEVELING
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Height Sens Pw Supply Val	Rear height control sensor power supply value / 0 to 6.25 V	Approximately 5.0 V	-
   Rr Height Sens Signal Val	Rear height control sensor signal value / 0 to 5 V	Approximately 2.5 V (When the vehicle is level)	Value is changed according to vehicle height

   OK

   Normal conditions listed above are displayed.

NG → See step   4 

OK → See step   11 

1. Connect 3 dry cell batteries (1.5 V) in series.
   Fig 1: Inspecting Rear Height Control Sensor Sub-Assembly RH With Connector End View

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Remove the rear height control sensor sub-assembly RH. Refer to REMOVAL .
3. Connect the positive (+) lead from the batteries to terminal 3 (SHB) and the negative (-) lead from the batteries to terminal 1 (SHG).
4. Measure the voltage between terminals 2 (SHRR) and 1 (SHG) while slowly moving the link up and down.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   2 (SHRR) - 1 (SHG)	+45° (High)	3.6 to 4.4 V
   	0° (Normal)	2.0 to 2.4 V
   	-35° (Low)	0.8 to 1.0 V

   TEXT IN ILLUSTRATION
   
   

   *a	Component with harness connected (Rear Height Control Sensor Sub-assembly RH)
   *b	(Low)
   *c	Standard position
   *d	(High)

NG → See step   12 

OK: Go to next step 

1. Disconnect the A48 headlight leveling ECU assembly connector.
2. Disconnect the S3 rear height control sensor sub-assembly RH connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A48-12 (SBR) - S3-3 (SHB)	Always	Below 1 Ω
   A48-19 (SHRL) - S3-2 (SHRR)	Always	Below 1 Ω
   A48-21 (SGR) - S3-1 (SHG)	Always	Below 1 Ω
   A48-12 (SBR) - Body ground	Always	10 kΩ or higher
   A48-19 (SHRL) - Body ground	Always	10 kΩ or higher
   A48-21 (SGR) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   11 

1. Check for DTCs. Refer to DTC CHECK / CLEAR .

   Result

   Result	Proceed to
   DTC "C1628 Height Control Sensor Circuit Malfunction" is not output.	OK
   DTC "C1628 Height Control Sensor Circuit Malfunction" output.	NG

NG → See step   13 

OK: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / HL Auto Leveling / Data List.
5. Read the display on the Techstream.
   HL AUTO LEVELING
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Height Sens Pw Supply Val	Rear height control sensor power supply value/0 to 6.25 V	Approximately 5.0 V	-
   Rr Height Sens Signal Val	Rear height control sensor signal value/0 to 5 V	Approximately 2.5 V (When the vehicle is level)	Value is changed according to vehicle height

   OK

   Normal conditions listed above are displayed.

NG → See step   8 

OK → See step   11 

1. Disconnect the A48 headlight leveling ECU assembly connector.
2. Disconnect the L65 parking assist ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A48-12 (SBR) - L65-28 (HB+)	Always	Below 1 Ω
   A48-19 (SHRL) - L65-8 (HO1)	Always	Below 1 Ω
   A48-21 (SGR) - L65-29 (HGND)	Always	Below 1 Ω
   A48-12 (SBR) - Body ground	Always	10 kΩ or higher
   A48-19 (SHRL) - Body ground	Always	10 kΩ or higher
   A48-21 (SGR) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Temporarily replace the parking assist ECU with a new or normally functioning one. Refer to REMOVAL .
2. Check for DTCs. Refer to DTC CHECK / CLEAR .

   OK

   DTC B241A is not output.

NG → See step   11 

OK → END (PARKING ASSIST ECU WAS DEFECTIVE)