Indicator Circuit

SUSPENSION CONTROL: AIR SUSPENSION SYSTEM: Indicator Circuit
- Indicator Circuit

DESCRIPTION

The absorber control switch and height control switch send signals to the mirror switch through LIN communication, and the suspension control ECU sends signals to the mirror switch through CAN communication. If an absorber control switch or height control switch signal is input into the suspension control ECU, the ECU sends a signal to the combination meter, which then illuminates the indicator light.

WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
* Before performing troubleshooting, inspect the connectors of related circuits.
* Before replacing the suspension control ECU, perform all of the following again: 1) symptom simulation Electronic Circuit Inspection Procedure; 2) DTC inspection; and 3) Techstream inspection (Data List or Active Test). If no malfunctions are found in other areas, replace the suspension control ECU.
* If the suspension control ECU or height control sensor is replaced, the vehicle height offset calibration must be performed Programming and Relearning.

PROCEDURE

1. CHECK ECUS CONNECTED TO CAN BUS

(a) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

(c) Check ECUs connected to CAN bus Diagnosis System.

Result





B -- GO TO CAN COMMUNICATION SYSTEM How to Proceed With Troubleshooting
A -- Continue to next step.

2. CHECK DTC (ALL)

(a) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

(c) Check for DTC all.

Result





B -- GO TO CAN COMMUNICATION SYSTEM How to Proceed With Troubleshooting

C -- GO TO LIN COMMUNICATION SYSTEM LIN Communication System
A -- Continue to next step.

3. CHECK INDICATOR LIGHT OPERATION (ACTIVE TEST)

(a) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the engine switch on (IG) and the Techstream on.

(d) Enter the following menus: Body Electrical / Combination Meter / Active Test.

(e) Check the condition of the absorber control indicator light and height control indicator light by operating the Techstream.

Combination Meter





OK:

Indicator light turns on when operating the Techstream.

NG -- GO TO METER / GAUGE SYSTEM How To Proceed With Troubleshooting
OK -- Continue to next step.

4. CHECK SWITCH SIGNAL (SUSPENSION CONTROL ECU DATA LIST)

(a) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the engine switch on (IG) and the Techstream on.

(d) Enter the following menus: Chassis / Air suspension / Data List.

(e) Select each item below in the Data List and read its value displayed on the Techstream.

Air suspension





OK:

On the Techstream screen, item changes between ON and OFF according to switch operation.

Result





B -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Symptom Related Diagnostic Procedures
A -- Continue to next step.

5. CHECK SWITCH SIGNAL (NO. 1 CONSOLE SWITCH DATA LIST)

(a) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the engine switch on (IG) and the Techstream on.

(d) Enter the following menus: Body Electrical / Center Console Switch / Data List.

(e) Select each item below in the Data List and read its value displayed on the Techstream.

Center Console Switch





OK:

On the Techstream screen, item changes between ON and OFF according to switch operation.

NG -- REPLACE NO. 1 CONSOLE SWITCH

OK -- REPLACE SUSPENSION CONTROL ECU Removal