Displaying & Reading Trouble Codes

NOTE: This is the only information provided by the manufacturer for reading Diagnostic Trouble Codes for this system.

PRE-CHECK

1. PRECAUTION
a. A GPS antenna for the mayday system is installed near the rear speakers. Therefore, attaching a metallic film to the rear glass or setting any object close to the rear speakers prevents the position data from being received properly.
b. If the ignition switch is turned ON with the airbag ECU connectors disconnected, or if a vehicle battery is removed with the ignition switch ON or if the (+)B circuit is OPEN within 10 seconds after the ignition switch is turned OFF, the system will determine this condition as a failure and it will automatically call the call center.
To prevent this, perform the following when working on operation related to the airbag ECU or a battery:
- Disconnect the connectors of the mayday ECU and the backup battery before disconnecting the airbag ECU connector. (Disconnect the connectors of the vehicle harness and the mayday assembly.)
- Be sure that the ignition switch is OFF when removing a vehicle battery.

HINT:
- When an accidental call is made automatically, access to the call center and ask them to cut off the line.
- If no signal has been received from the airbag ECU since the ignition switch was turned ON, a service call will be made.
- If good signal reception from the airbag ECU after the ignition switch ON is interrupted, an emergency call will be made.

c. When the life of the back-up battery becomes short, the voltage gets down and at this time Mayday ECU detects "DTC5". In this case, proceed troubleshooting by following "DTC5".

2. DIAGNOSIS SYSTEM
When a system error is detected, the mayday system will inform the driver of the error by providing the following voice warning: "A LEXUS Link System error has been detected. Please contact your LEXUS dealer." Also, in the case below, it will make a service call to the call center.
- While the ignition switch is ON, the mayday ECU cannot receive BEAN signal from the airbag ECU.
- While the ignition switch is ON, power is not supplied from a vehicle battery.

3. DTC CHECK
Repeatedly turning ON and OFF the ignition switch 3 times within 15 seconds while pressing "PLAY" or "VOLUME(+)" allows the system to enter the diagnosis mode. In this mode, diagnosis result is informed by a voice.
Refer to DIAGNOSIS TROUBLE CODE CHART for DTC details.

4. DTC CLEARANCE
DTC will be cleared when the trouble is recovered normally.




5. LEXUS LINK SYSTEM INFRASTRUCTURE TROUBLESHOOT