C1791

SUSPENSION CONTROL: ACTIVE HEIGHT CONTROL SUSPENSION: C1791: Absorber Control Switch Circuit (Test Mode DTC)
C1791 - Absorber Control Switch Circuit (Test Mode DTC)

DESCRIPTION

This circuit is used for sending the signal to the suspension control ECU to switch to the damping mode selected by the damping force 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 Programming and Relearning.

PROCEDURE

1. READ VALUE USING TECHSTREAM (SPORT SWITCH, COMFORT SWITCH)

(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 (DAMPING MODE SELECT 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 C1791 is cleared Scan Tool Testing and Procedures.

Result





B -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting

A -- REPLACE SUSPENSION CONTROL ECU Removal

3. INSPECT INTEGRATION CONTROL AND PANEL (DAMPING MODE SELECT 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 Removal
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 Removal