C1788

SUSPENSION CONTROL: AIR SUSPENSION SYSTEM: C1788/88: Height Control OFF Switch Circuit


DESCRIPTION

When selecting the height control OFF switch, all the vehicle height controls are suspended. Do not work under the vehicle, when the height control OFF switch does not operate properly. Disallowance of the vehicle height control is recorded even when the minus terminal of the battery is disconnected.






WIRING DIAGRAM





INSPECTION PROCEDURE
HINT: Start the inspection from step 1 when using the intelligent tester, and start from step 2 when not using the intelligent d tester.

PROCEDURE

1. READ VALUE USING INTELLIGENT TESTER
(a) Connect the intelligent tester to the DLC3.
(b) Turn the ignition switch to the ON position, and push the intelligent tester main switch on.
(c) Select the item below in the DATA LIST, and read its value displayed on the intelligent tester.
AIRSUS:





(d) Check that the value displayed on the intelligent tester changes by pressing the height control OFF switch.
OK:
Height control OFF switch value changes.
NG -- INSPECT HEIGHT CONTROL OFF SWITCH
OK -- REPLACE SUSPENSION CONTROL ECU
2. INSPECT HEIGHT CONTROL OFF SWITCH





(a) Disconnect the height control OFF switch connector.
(b) Measure the resistance according to the values in the table below.
Standard resistance:






NG -- REPLACE HEIGHT CONTROL OFF SWITCH
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (SUSPENSION CONTROL ECU - HEIGHT CONTROL OFF SWITCH)





(a) Disconnect the suspension control ECU S15 connector.
(b) Measure the resistance according to the values in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
4. CHECK HARNESS AND CONNECTOR (HEIGHT CONTROL OFF SWITCH - BODY GROUND)





(a) Measure the resistance according to the values in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE SUSPENSION CONTROL ECU