Up to 08/2009

LIGHTING (EXT): LIGHTING SYSTEM: B241A: Rear Height Control Sensor
B241A - Rear Height Control Sensor

DESCRIPTION

w/o Air Suspension System:

The AFS ECU (headlight swivel ECU assembly) receives signals indicating the height of the vehicle from the rear height control sensor sub-assembly RH.





w/ Air Suspension System:

The AFS ECU (headlight swivel ECU assembly) receives signals regarding the height of the vehicle from the suspension control ECU.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK FOR DTC

(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

(b) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.

OK:

DTC B241A is not output.

NG -- CHECK VEHICLE CONDITION

OK -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting

2. CHECK VEHICLE CONDITION

(a) Check the vehicle condition.

Result





B -- CHECK FOR DTC (AIR SUSPENSION SYSTEM)
A -- Continue to next step.

3. READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / AFS / Data List.

(e) Read the display on the Techstream.

AFS





OK:

Normal conditions listed above are displayed.

NG -- CHECK HARNESS AND CONNECTOR (AFS ECU - REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY RH)
OK -- Continue to next step.

4. INSPECT REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY RH

(a) Connect 3 dry cell batteries (1.5 V) in series.





(b) Remove the rear height control sensor sub-assembly RH Components.

(c) Connect a positive (+) lead from the battery to terminal 3 (SHB) and a negative (-) lead from the battery to terminal 1 (SHG).

(d) Measure the voltage between terminals 2 (SHRR) and 1 (SHG) while slowly moving the link up and down.

Standard Voltage:





Text in Illustration





NG -- REPLACE REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY RH Components

OK -- REPLACE AFS ECU (HEADLIGHT SWIVEL ECU ASSEMBLY) Components

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

(a) Disconnect the A53 AFS ECU (headlight swivel ECU assembly) connector.





(b) Disconnect the R4 rear height control sensor sub-assembly RH connector.

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

Standard Resistance:





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

6. INSPECT REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY RH

(a) Connect 3 dry cell batteries (1.5 V) in series.





(b) Remove the rear height control sensor sub-assembly RH Components.

(c) Connect a positive (+) lead from the battery to terminal 3 (SHB) and a negative (-) lead from the battery to terminal 1 (SHG).

(d) Measure the voltage between terminals 2 (SHRR) and 1 (SHG) while slowly moving the link up and down.

Standard Voltage:





Text in Illustration





NG -- REPLACE REAR HEIGHT CONTROL SENSOR SUB-ASSEMBLY RH Components

OK -- REPLACE AFS ECU (HEADLIGHT SWIVEL ECU ASSEMBLY) Components

7. CHECK FOR DTC (AIR SUSPENSION SYSTEM)

(a) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.

OK:

DTC "C1714 Rear Height Control Sensor LH Circuit Malfunction" is not output.

NG -- GO TO AIR SUSPENSION SYSTEM C1711
OK -- Continue to next step.

8. READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / AFS / Data List.

(e) Read the display on the Techstream.

AFS





OK:

Normal conditions listed above are displayed.

NG -- CHECK HARNESS AND CONNECTOR (SUSPENSION CONTROL ECU - AFS ECU)
OK -- Continue to next step.

9. REPLACE SUSPENSION CONTROL ECU

(a) Temporarily replace the suspension control ECU with a new or normally functioning one Components.

(b) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.

OK:

DTC B2416 is not output.

NG -- REPLACE AFS ECU (HEADLIGHT SWIVEL ECU ASSEMBLY) Components

OK -- END

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

(a) Disconnect the A53 AFS ECU (headlight swivel ECU assembly) connector.





(b) Disconnect the A54 and A55 suspension control ECU connectors.

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

Standard Resistance:





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

11. REPLACE SUSPENSION CONTROL ECU

(a) Temporarily replace the suspension control ECU with a new or normally functioning one Components.

(b) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.

OK:

DTC B2416 is not output.

NG -- REPLACE AFS ECU (HEADLIGHT SWIVEL ECU ASSEMBLY) Components

OK -- END