C1786

SUSPENSION CONTROL: AIR SUSPENSION SYSTEM: C1786/86: Height Control Switch Circuit

DTC C1786/86 - Height Control Switch Circuit

DESCRIPTION

By controlling the height control switch, the vehicle height can be set 30 mm (1.18 in.) higher in "HI mode" and 15 mm (0.59 in.) lower in "LO mode" than normal vehicle height.
Even though the vehicle is operated in normal mode, the vehicle height is set approx. 7.5 mm (0.295 in.) lower than normal vehicle height while driving at high speed.
HINT: Driving in the "HI mode" is only possible when the vehicle's speed is less than 30 km/h (19 mph).





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 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 switch "UP" or "DOWN".
OK:
Height control switch value changes.
NG -- INSPECT HEIGHT CONTROL SWITCH
OK -- REPLACE SUSPENSION CONTROL ECU
2. INSPECT HEIGHT CONTROL SWITCH





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






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