Reading and Clearing Diagnostic Trouble Codes

CELLULAR COMMUNICATION: LEXUS LINK SYSTEM: DTC CHECK / CLEAR

DTC CHECK / CLEAR

1. DTC CHECK / CLEAR (Using Mayday Switch)
HINT: Turn the engine switch on (IG), wait 5 seconds, and then check the DTC.

(a) Current DTC check
With the engine switch on (IG), press and hold the PTT button, and then press the VOL+ button 5 times within 15 seconds.
(b) Historic DTC check
With the engine switch on (IG), press and hold the PTT button, and then press the VOL- button 5 times within 15 seconds.
(c) Clear historic DTC
With the engine switch on (IG), press and hold the PTT button, and then press the door unlock switch of the power window regulator master switch 5 times within 15 seconds.
2. DTC CHECK / CLEAR (Using Techstream)
(a) Check DTC
(1) Connect the Techstream to the DLC3.
(2) Turn the engine switch on (IG).
(3) Turn the Techstream on.
(4) Enter the following menus: Body Electrical / Mayday Gateway / Trouble Codes.
(5) Read the DTCs.
(b) Clear DTC
(1) Connect the Techstream to the DLC3.
(2) Turn the engine switch on (IG).
(3) Turn the Techstream on.
(4) Enter the following menus: Body Electrical / Mayday Gateway / Trouble Codes.
(5) Erase the DTCs.
3. LED BLINKING PATTERN
When the system is in the diagnosis mode, the red and green LEDs on the mayday switch will blink in the applicable pattern. The blinking pattern shown in the illustration is an example of DTC 3-2 and 4-3.
DTCs will be output in numerical order.
A set of DTC blinking patterns will be output twice.





4. EXIT DIAGNOSIS MODE
Diagnosis mode can be exited by turning the engine switch off.
5. INFRASTRUCTURE TROUBLESHOOTING
LEXUS Link system:









HINT:
*1: If replacement of the ECU is necessary, replace the mayday battery (backup battery) together with the ECU. After the replacement, register the ECU.
*2: Telephone antenna includes peripheral parts such as the telephone antenna rod, telephone antenna base, antenna wire, etc.
*3: When running the vehicle, make sure it is in the LEXUS Link service area. If on a level surface, the vehicle may only need to be driven a short distance before a connection can be made. If in a mountainous area, the vehicle may have to be driven a long distance before the connection can be made.