Toyota Sequoia (2005). Manual - part 229

DIDCV–01

C00083

DLC3

CG

TS

F16800

Height 
Control 
Manual 
Indicator 
Lamp

–

DIAGNOSTICS

AIR SUSPENSION SYSTEM

DI–711

905

TEST MODE PROCEDURE

1.

INPUT SIGNAL CHECK (Using SST check wire)

HINT:

This function checks if signals from the stop light switch
assy and the door courtesy lamp switch, etc. are being in-
put normally to the ECU.

When entering test mode, the suspension control ECU
sets all the test mode DTCs first.
After completing the test mode for each check item, the
test mode DTCs that are determined normal by the sus-
pension control ECU will be erased.
The test mode DTCs for other check items may not be
erased when only a certain signal is inspected.

When the test mode returns back to normal mode, all the
test mode DTCs will be erased.

(a)

Procedure for Input Signal Check Mode (Test Mode) us-
ing SST check wire.
SST

09843–18040

(1)

Make sure the ignition switch is OFF.

(2)

Set each of the check items to the condition shown
under Operation (A) in the test mode table on the
next page.

(3)

Using SST, connect terminals TS and CG of the
DLC3.

(4)

Turn the ignition switch to the  ON position.

(5)

Check that the height control manual indicator lamp
is blinking.

HINT:

The height control manual indicator lamp comes on for 2
seconds, then blinks at 0.25 sec. intervals.

If the height control manual indicator light does not blink,
inspect the height control manual indicator lamp circuit
(See page 

DI–789

).

C00083

DLC3

CG

TC

TS

F16800

Height 
Control 
Manual 
Indicator 
Lamp

DI–712

–

DIAGNOSTICS

AIR SUSPENSION SYSTEM

906

The TS terminal circuit uses CAN (Controller Area Net-
work) for communication. Therefore, if there are any mal-
functions in the communication circuit, one or more DTCs
in the CAN communication system is/are output.
(6)

Set each of the check items to the condition shown
under Operation (B) in the test mode table below.

HINT:
When checking each item, the height control manual indicator
lamp comes on for 1 second.

Test mode table:

Check Item

Operation (A)

Operation (B)

Stop light switch signal

OFF (Brake pedal not depressed)

ON (Brake pedal depressed)

Door courtesy light switch signal

ON (Each door opened)

OFF (All doors closed)

Height control switch signal

–

Press the height control switch ”UP” first and

then press ”DOWN”

Height control mode select switch signal

OFF (Height control mode select switch not

pushed in)

ON to OFF (Height control mode select switch

pushed in and released)

(7)

Using SST, connect the 3rd terminal of the SST
check wire to terminal TC of the DLC3.

SST

09843–18040

(8)

Read the number of blinks of the height control
manual indicator lamp.

F16802

0.25 sec.

0.5 sec.

ON

OFF

0.25 sec.

4.5 sec.

ON

OFF

1.5 sec.

Normal:

Code 82:

0.5 sec.

Repeat

–

DIAGNOSTICS

AIR SUSPENSION SYSTEM

DI–713

907

HINT:

As examples, the blinking patterns of a normal system
code and code 82 are shown in the illustration.

If 2 or more malfunctions are indicated at the same time,
the lowest numbered code is displayed first.

When a DTC is not output, check the TC terminal circuit
on page 

DI–1567

.

(9)

Check the malfunction using the code table on the
next page.

(b)

Ending the Input Signal Check Mode (Test Mode) using
SST check wire.
SST

09843–18040

(1)

With the ignition switch OFF, disconnect the SST
check wire from the terminals of the DLC3 and then
turn the ignition switch to the ON position.

(c)

Procedure for Sensor Test Mode (Test Mode) using the
hand–held tester.
(1)

Make sure the ignition switch is OFF.

(2)

Set each of the check items to the condition shown
under Operation (A) in the test mode table on the
previous page.

(3)

Connect the hand–held tester to the DLC3.

(4)

Turn the ignition switch to the ON position.

(5)

Select SIGNAL CHECK mode on the hand–held
tester.

(6)

Set each of the check items to the condition shown
under Operation (B) in the test mode table on the
previous page.

HINT:
In step (6), all signals can be checked together.

(7)

Read the DTCs by following the prompts on the tes-
ter screen.

HINT:
Refer to the hand–held tester operator’s manual for further de-
tails.

A08841

Hand–held
Tester

DLC3

DI–714

–

DIAGNOSTICS

AIR SUSPENSION SYSTEM

908

DTC of air suspension system test mode (input signal check) function:
If a trouble code is displayed during the test mode DTC check, check the circuit listed for that code. For details
of each code, refer to ”See page” under the respective DTC No. in the chart.

DTC No.

(See Page)

Detection Item

Trouble Area

C1782/82

(

DI–767

)

Stop light switch circuit malfunction

Stop light switch assy

Stop light switch circuit

Suspension control ECU

C1783/83

(

DI–770

)

Door courtesy switch circuit malfunction

Door courtesy light switch assy

W/ Motor back door assy

Door courtesy light switch circuit

Body ECU

Back door ECU

Suspension control ECU

C1786/86

(

DI–774

)

Height control switch circuit malfunction

Height control switch

Height control switch circuit

Suspension control ECU

C1788/88

(

DI–778

)

Height control mode select switch circuit malfunction

Height control mode select switch

Height control mode select switch circuit

Suspension control ECU

2.

INPUT SIGNAL CHECK (Using Hand–held Tester)

HINT:

This function checks if signals from the stop light switch
assy and the door courtesy lamp switch, etc. are being in-
put normally to the ECU.

When entering test mode, the suspension control ECU
sets all the test mode DTCs first.
After completing the test mode for each check item, the
test mode DTCs that are determined normal by the sus-
pension control ECU will be erased.
The test mode DTCs for other check items may not be
erased when only a certain signal is inspected.

When the test mode returns back to normal mode, all the
test mode DTCs will be erased.

(a)

Procedure for Test Mode (Input signal check).
(1)

Make sure that the ignition switch is off.

(2)

Set each of the check items to the condition shown
under Operation (A) in the test mode table on the
next page.

(3)

Connect the hand–held tester to the DLC3.

(4)

Turn the ignition switch to the ON position.

(5)

Select TEST MODE mode on the hand–held tester.

(6)

Set each of the check items to the condition shown
under Operation (B) in the test mode table below.