Last Modified: 11-29-2007 1.6 C
Service Category: Suspension Section: Suspension Control System
Model Year: 2008 Model: Sequoia Doc ID: RM000003FV9000X
Title: SUSPENSION CONTROL: AIR SUSPENSION SYSTEM (w/ AVS): DESCRIPTION (2008 Sequoia)

DTC

C1791

Absorber Control Switch Circuit (Test Mode DTC)

DESCRIPTION

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

DTC Code

Detection Condition

Trouble Area

C1791

Absorber control switch signal does not change.
  • Absorber control switch
  • Wire harness or connector
  • Suspension control ECU

HINT:

This DTC is output only when the sensor signal check is done.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1.

READ VALUE USING TECHSTREAM (ABSORBER CONTROL SWITCH)

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the ignition switch to ON, and turn the Techstream main switch on.

(d) Enter the following menus: Chassis / Air suspension / Data List.

Air Suspension

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

COMFORT Switch

Absorber control switch (COMFORT) / ON or OFF

ON: COMFORT

OFF: Normal

-

SPORT Switch

Absorber control switch (SPORT) / ON or OFF

ON: SPORT

OFF: Normal

-

(e) Check that the value displayed on the Techstream changes by operating the absorber control switch "COMFORT" or "SPORT".

OK:

Absorber control switch value changes.

Result

Result

Proceed to

NG

A

OK (When troubleshooting according to the Problem Symptoms Table)

B

OK (When troubleshooting according to the DTC Chart)

C
A

2.

INSPECT ABSORBER CONTROL SWITCH

(a) Turn the ignition switch off.

(b) Remove the absorber control switch.

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

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

7 (GND) - 8 (ECU1)

COMFORT position

Below 1 Ω

Normal position

10 kΩ or higher

7 (GND) - 9 (ECU2)

SPORT position

Below 1 Ω

Normal position

10 kΩ or higher
OK

3.

CHECK HARNESS AND CONNECTOR (ABSORBER CONTROL SWITCH - ECU AND BODY GROUND)

(a) Disconnect the O18 ECU connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

H71-8 (ECU1) - O18-3 (TSW1)

Always

Below 1 Ω

H71-9 (ECU2) - O18-2 (TSW2)

Always

Below 1 Ω

H71-7 (GND) - Body ground

Always

Below 1 Ω

H71-8 (ECU1) or O18-3 (TSW1) - Body ground

Always

10 kΩ or higher

H71-9 (ECU2) or O18-2 (TSW2) - Body ground

Always

10 kΩ or higher
OK