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 assembly is malfunctioning; 2) the center airbag sensor assembly is malfunctioning; or 3) the communication line is open or short.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK DTC OUTPUT (BLINKING PATTERN)
(a) Turn the ignition switch from ON to OFF.
(b) Turn the ignition switch ON and wait 10 seconds.
(c) Check for the DTC again and wait for 20 seconds.
OK:
DTC 5-2 is not output.
OK -- CLEAR HISTORIC DTC
NG -- Continue to next step.
2. CHECK SUPPLEMENTAL RESTRAINT SYSTEM
(a) Check for DTC using the intelligent tester.

Result





A -- GO TO SUPPLEMENTAL RESTRAINT SYSTEM
B -- Continue to next step.
3. CHECK WIRE HARNESS (MAYDAY ECU ASSEMBLY - CENTER AIRBAG SENSOR ASSEMBLY)
(a) Disconnect the cable from the negative (-) battery terminal and wait 90 seconds.




(b) Disconnect the M15 ECU connector.
(c) Disconnect the A28 airbag connector.
(d) Measure the resistance of the wire harness side connectors.
Standard resistance:





NOTE:
If replacement of the ECU is necessary, replace the mayday battery (backup battery) together with the ECU. After the replacement, register the ECU Programming and Relearning.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE MAYDAY ECU ASSEMBLY