DTC 5-2

CELLULAR COMMUNICATION: LEXUS LINK SYSTEM: 5-2: Airbag Signal Communication Error

DTC 5-2 - Airbag Signal Communication Error

DESCRIPTION

This DTC is output when one of the following occurs: 1) the mayday ECU is malfunctioning; 2) the center airbag sensor is malfunctioning; or 3) the communication line is open or shorted.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK FOR DTC (BLINKING PATTERN)
(a) Turn the engine switch from on (IG) to off.
(b) Turn the engine switch on (IG) and wait for 10 seconds.
(c) Check for the DTC again and wait for 20 seconds Reading and Clearing Diagnostic Trouble Codes.
OK:
DTC 5-2 is not output.
NG -- CHECK SUPPLEMENTAL RESTRAINT SYSTEM
OK -- CLEAR HISTORIC DTC
2. CHECK SUPPLEMENTAL RESTRAINT SYSTEM
(a) Check for DTC using the Techstream DTC Check / Clear.

Result





A -- GO TO SUPPLEMENTAL RESTRAINT SYSTEM
B -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (MAYDAY ECU - CENTER AIRBAG SENSOR)




NOTE:
After the engine switch is turned off, the HDD navigation system requires approximately 6 minutes to record various types of memory and settings. As a result, after turning the engine switch off, wait 6 minutes or more before disconnecting the cable from the negative (-) battery terminal.
(a) Disconnect the cable from the negative (-) battery terminal and wait for 90 seconds.
(b) Disconnect the R24 ECU connector.
(c) Disconnect the L73 airbag sensor connector.
(d) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR THEN CLEAR HISTORIC DTC
OK -- REPLACE MAYDAY ECU TOGETHER WITH MAYDAY BATTERY AND THEN PERFORM REGISTRATION