Section 17 (Sliding Roof System - Diagnostics): Pre-Check

WARNING: This page is about a different car, the 2005 Lexus LX 470. However, it is still accessible from the selected car via links, so may be relevant.

DIAGNOSIS SYSTEM

Description
ECU data in this system can be read from DLC3 on the vehicle.

Therefore, when there seems to be a trouble on this system, use hand-held tester to check and troubleshoot it.

Fig 1: Connecting Hand-Held Tester To DLC3
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Check DLC3.
The vehicle's ECM uses ISO 9141-2 for communication. The terminal arrangement of DLC3 complies with SAE J1962 and matches the ISO 9141-2 format.

Fig 2: Identifying DLC3 Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

DLC3 REFERENCE

Terminal No.	Connection/Specified Condition	Condition.
4	Chassis Ground --> Body Ground/1 or less	Always
13	TC --> Body Ground/9 - 14 V	Always

HINT:

If the display shows "UNABLE TO CONNECT TO VEHICLE" when the cable of the hand-held tester is connected to DLC3, the ignition switch is turned ON and the hand-held tester is operated, there is a problem either on the vehicle side or tool side.

If communication is normal when the tool is connected to another vehicle, inspect DLC3 on the original vehicle.
If communication does not function when the tool is connected to another vehicle, the problem is probably in the tool itself, so consult the Service Department listed in the tool's instruction manual.

DATA LIST

HINT:

By the DATA LIST displayed on the Hand-held tester, you can read the value of the switch, sensor, actuator and so on without removing any parts. Reading the DATA LIST as a first step of troubleshooting is one of the method to shorten the labor time.

Turn the ignition switch OFF.
Connect the hand-held tester to DLC3.
Turn the ignition switch ON.
According to the display on tester, read the "DATA LIST".

DATA LIST

Item	Condition (Parameter)	Normal Condition	Diagnostic Note
OPEN SW	Sliding roof switch free --> open (OFF/ON)	OFF --> ON	-
CLOSE SW	Sliding roof switch free --> CLOSE (OFF/ON)	OFF --> ON	-
UP SW	Sliding roof switch free --> UP (OFF/ON)	OFF --> ON	-
DOWN SW	Sliding roof switch free --> DOWN (OFF/ON)	OFF --> ON	-
LIMIT SW1	Sliding roof operation (OFF/ON)	OFF --> ON --> OFF	-
LIMIT SW2	Sliding roof operation (OFF/ON)	OFF --> ON --> OFF	-
MOTOR PULSE	Sliding roof motor stop --> moving (HI/LO)	HI --> LO	-
MOTOR STATUS	Sliding roof motor stop --> moving (LOCK/NORMAL)	NORMAL	-
IG(DIRCT SIG)	IG switch ON (OFF/ON)	ON	-
IG (MPX)	IG switch ON (OFF/ON)	ON	BEAN signal
KEY OPEN OPERT	Door key operation free --> OPEN (OFF/ON)	OFF --> ON	-
KEY CLOSE OPERT	Door key operation free --> CLOSE (OFF/ON)	OFF --> ON	-
WIRLES OPN OPRT	Wireless key operation free --> OPEN (OFF/ON)	OFF --> ON	-
WIRLESCLOPRT	Wireless key operation free --> CLOSE (OFF/ON)	OFF --> ON	-
CLOSE SIGNAL	Sliding roof close signal (CLOSE/OPEN)	CLOSE	-
KEY OFF PERMS	Key OFF permission (OFF/ON)	-	BEAN signal
OPEN /DOOR KEY	Door key related OPEN operation (NOT AVL/AVAIL)	-	BEAN signal
CLOSE /DOOR KEY	Door key related CLOSE operation (NOT AVL/AVAIL)	-	BEAN signal
OPEN/WIRELESS	Wireless key related CLOSE operation (NOT AVL/AVAIL)	-	BEAN signal
DOOR KEY OPER	Door key related operation (SLIDE/TILT)	-	-
WIRELESS OPER	Wireless key related operation (SLIDE/TILT)	-	-
D-DOOR WARN SW	Driver's door courtesy (OFF/ON)	-	-

ACTIVE TEST

HINT:

Performing ACTIVE TEST using the Hand-held tester allows the relay, and so on to operate without removing any parts. Performing ACTIVE TEST as a first step of troubleshooting is one of the method to shorten the labor time.

DATA LIST can be displayed during the ACTIVE TEST.

Turn the ignition switch OFF.
Connect the Hand-held tester to DLC3.
Turn the ignition switch ON.
According to the display on tester, perform the "ACTIVE TEST".

ACTIVE TEST DATA LIST

Item	Condition	Parameter	Diagnostic Note.
SLIDE ROOF	Sliding roof operation	CLOS/UP - OPN/DWN	Confirm that the vehicle is parked. CAUTION: This test causes vehicle parts to move. Please watch your hands and feet.