C1786

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

DTC C1786/86 - Height Control Switch Circuit

DESCRIPTION

Vehicle height can be chosen by pressing the height control switch.
By pressing the "UP" side, vehicle height goes up.
By pressing the "DOWN" side, vehicle height goes down.






WIRING DIAGRAM





INSPECTION PROCEDURE
HINT: Start the inspection from step 1 when using the Techstream and start from step 2 when not using the Techstream.

PROCEDURE

1. READ VALUE USING DATA LIST (HEIGHT SW DOWN AND HEIGHT SW UP)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch ON and the Techstream on.
(c) Select the item "Height Control SW (Down)" or "Height Control SW (Up)" in the Data List, and read its value displayed on the Techstream.
(d) Check that the value displayed on the Techstream changes by pressing the height control switch "UP" or "DOWN".
OK:
Height control switch value changes.
OK -- REPLACE SUSPENSION CONTROL ECU
NG -- Continue to next step.
2. INSPECT HEIGHT CONTROL SWITCH




(a) Remove the height control switch connector.
(b) Check continuity between each terminal of the height control switch when the height control switch position is "UP", "OFF" and "DOWN".
Standard:





HINT: When the height control switch is faulty, replace the suspension control switch.

NG -- REPLACE HEIGHT CONTROL SWITCH
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (HEIGHT CONTROL SWITCH - SUSPENSION CONTROL ECU)
(a) Check for open and short circuit in the harness and the connector between the height control switch and the suspension control ECU Electronic Circuit Inspection Procedure.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE SUSPENSION CONTROL ECU