Dtc C1791/91 Adaptive Variable Suspension (Avs) Switch Circuit (Test Mode Dtc)


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING INTELLIGENT TESTER (DAMPING CONTROL SWITCH)

INSPECT CENTER CLUSTER MODULE SWITCH

CHECK HARNESS AND CONNECTOR (CENTER CLUSTER MODULE SWITCH - SUSPENSION CONTROL ECU)

DTC C1791/91 Adaptive Variable Suspension (AVS) Switch Circuit (Test Mode DTC)


DESCRIPTION

The absorber control switch is used to select the damping force mode of the shock absorber.

DTC Code
DTC Detection Condition
Trouble Area
C1791/91
The absorber control switch signal does not change.
  1. Absorber control switch (Center cluster module switch)
  2. Harness or connector
  3. Suspension control ECU
HINT:
This DTC is stored only during test mode.

WIRING DIAGRAM


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Suspension Control.Air Suspension System. Dtc C1791/91 Adaptive Variable Suspension (Avs) Switch Circuit (Test Mode Dtc)


INSPECTION PROCEDURE

NOTICE:
When replacing the suspension control ECU, perform registration (LandCruiser RM000003X4500TX.html).
1.READ VALUE USING INTELLIGENT TESTER (DAMPING CONTROL SWITCH)

  1. Turn the ignition switch off.

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the intelligent tester on.

  1. Enter the following menus: Chassis / Air suspension / Data List.

    Air Suspension
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    Damping Control Switch
    		Absorber control switch /
    NORMAL, COMFORT or SPORT
    		Indicates current absorber control switch position
    		-

  1. Check that the value displayed on the intelligent tester changes by operating the absorber control switch between COMF, NORMAL and SPORT.

    OK:
    Absorber control switch value changes.


NG
Go to step 2
OK

USE SIMULATION METHOD TO CHECK (LandCruiser RM000003YMJ00XX.html)

2.INSPECT CENTER CLUSTER MODULE SWITCH

  1. Turn the ignition switch off.

  1. Remove the absorber control switch (center cluster module switch) (LandCruiser RM000003A0H00WX.html).



    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Suspension Control.Air Suspension System. Dtc C1791/91 Adaptive Variable Suspension (Avs) Switch Circuit (Test Mode Dtc)

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		 Switch Condition
    		Specified Condition
    24 (E) - 9 (ECU1)
    		SPORT position
    		Below 1 Ω
    Normal position
    		10 kΩ or higher
    24 (E) - 8 (ECU2)
    		COMF position
    		Below 1 Ω
    Normal position
    		10 kΩ or higher
    Text in Illustration
    *a
    		Component without harness connected
    (Absorber Control Switch (Center Cluster Module Switch))


NG
REPLACE CENTER CLUSTER MODULE SWITCH (LandCruiser RM000003A0H00WX.html)
OK


3.CHECK HARNESS AND CONNECTOR (CENTER CLUSTER MODULE SWITCH - SUSPENSION CONTROL ECU)

  1. Disconnect the G156 absorber control switch (center cluster module switch) connector.

  1. Disconnect the A49 suspension control ECU connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		 Condition
    		Specified Condition
    G156-9 (ECU1) - A49-23 (TSW1)
    		Always
    		 Below 1 Ω
    G156-8 (ECU2) - A49-22 (TSW2)
    		Always
    		 Below 1 Ω
    G156-24 (E) - Body ground
    		Always
    		 Below 1 Ω
    G156-9 (ECU1) or A49-23 (TSW1) - Body ground
    		Always
    		10 kΩ or higher
    G156-8 (ECU2) or A49-22 (TSW2) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE SUSPENSION CONTROL ECU (LandCruiser RM000002BGR01UX.html)