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) intelligent tester or 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 Testing and Inspection.

PROCEDURE

1. CHECK ECUS CONNECTED TO CAN BUS
(a) Turn the power switch OFF.
(b) Connect the intelligent tester or Techstream to the DLC3.
(c) Check the 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 power switch OFF.
(b) Connect the intelligent tester or Techstream to the DLC3.
(c) Check for all DTCs.

Result





C -- GO TO LIN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)
B -- GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)
A -- Continue to next step.
3. CHECK INDICATOR LIGHT OPERATION (ACTIVE TEST)
(a) Turn the power switch OFF.
(b) Connect the intelligent tester or Techstream to the DLC3.
(c) Turn the power switch ON (IG) and the tester ON.
(d) Enter the following menus:
(1) Intelligent tester - Select: DIAGNOSIS / OBD/MOBD / BODY / METER /ACTIVE TEST.
(2) Techstream - Select: Body Electrical / Combination Meter / Active Test.
(e) Check the condition of the absorber control indicator light and height control indicator light by operating the tester.
(1) Intelligent tester

METER





(2) Techstream

Combination Meter





OK:
Indicator light turns on when operating tester.
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 power switch OFF.
(b) Connect the intelligent tester or Techstream to the DLC3.
(c) Turn the power switch ON (IG) and the tester ON.
(d) Enter the following menus:
(1) Intelligent tester - Select: DIAGNOSIS / OBD/MOBD / CHASSIS / AIR SUSPENSION / DATA LIST.
(2) Techstream - Select: Chassis / Air suspension / Data List.
(e) Select each item below in the DATA LIST and read its value displayed on the tester.
(1) Intelligent tester

AIR SUSPENSION





(2) Techstream

Air suspension





OK:
On tester screen, item changes between ON and OFF according to switch operation.
NG -- CHECK SWITCH SIGNAL (COMBINATION SWITCH DATA LIST)
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
5. CHECK SWITCH SIGNAL (COMBINATION SWITCH DATA LIST)
(a) Turn the power switch OFF.
(b) Connect the intelligent tester or Techstream to the DLC3.
(c) Turn the power switch ON (IG) and the tester ON.
(d) Enter the following menus:
(1) Intelligent tester - Select: DIAGNOSIS / OBD/MOBD / BODY / CENTER CONSOLE / DATA LIST.
(2) Techstream - Select: Body Electrical / Center Console Switch / Data List.
(e) Select each item below in the DATA LIST and read its value displayed on the tester.
(1) Intelligent tester

CENTER CONSOLE





(2) Techstream

Center Console Switch





OK:
On tester screen, item changes between ON and OFF according to switch operation.
NG -- REPLACE COMBINATION SWITCH
OK -- REPLACE SUSPENSION CONTROL ECU