C1792

SUSPENSION CONTROL: ACTIVE HEIGHT CONTROL SUSPENSION: C1792: Height Control Switch Circuit (Test Mode DTC)

DTC C1792 - Height Control Switch Circuit (Test Mode DTC)

DESCRIPTION

This circuit sends a signal to the suspension control ECU in order to adjust the height to the selected height by the height control switch.

WIRING DIAGRAM

INSPECTION PROCEDURE
NOTICE:
- Before performing troubleshooting, inspect the connectors of related circuits.
- If the suspension control ECU or height control sensor is replaced, the vehicle height offset calibration must be performed Testing and Inspection.

PROCEDURE

1. READ VALUE USING TECHSTREAM (HEIGHT CONTROL SWITCH (UP), HEIGHT CONTROL SWITCH (DOWN))
(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 / AHC / Data List.
(e) According to the display on the Techstream, read the Data List.

AHC

OK:
On the Techstream screen, item changes between ON and OFF according to switch operation.
NG -- INSPECT INTEGRATION CONTROL AND PANEL (HEIGHT CONTROL SWITCH)
OK -- Continue to next step.
2. TEST MODE INSPECTION
(a) Refer to the Test Mode Procedure and perform the signal check. Check that test mode DTC C1792 is cleared Test Mode Procedure.

Result

B -- USE SIMULATION METHOD TO CHECK
A -- REPLACE SUSPENSION CONTROL ECU
3. INSPECT INTEGRATION CONTROL AND PANEL (HEIGHT CONTROL SWITCH)
(a) Remove the integration control and panel Removal.

(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:

NG -- REPLACE INTEGRATION CONTROL AND PANEL
OK -- Continue to next step.
4. CHECK HARNESS AND CONNECTOR (SUSPENSION CONTROL ECU - SWITCH AND BODY GROUND)

(a) Disconnect the K30 ECU connector.
(b) Disconnect the V4 integration control and panel connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:

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