DTC 5-1

CELLULAR COMMUNICATION: LEXUS LINK SYSTEM: 5-1: LEXUS Link Communication Error

DTC 5-1 - LEXUS Link Communication Error

DESCRIPTION

This DTC is output when one of the following occurs: 1) the mayday ECU is malfunctioning; 2) the cowl side junction block RH (main body ECU RH) is malfunctioning; or 3) the BEAN line is open or short.






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.
OK:
DTC 5-1 is not output.
OK -- CLEAR HISTORIC DTC
NG -- Continue to next step.

2. CHECK FOR DTC
(a) Check for DTC using the Techstream.
HINT: The mayday ECU is connected to the BEAN. Check that there are no multiplex communication system DTCs present.

Result





B -- GO TO MULTIPLEX COMMUNICATION SYSTEM
A -- Continue to next step.

3. CHECK HEADLIGHT DIMMER SWITCH
(a) When the headlight dimmer switch is set to the low beam position, check that the combination meter indicator dims.
HINT: The mayday ECU uses the BEAN communication stop judgment to check for the dim signal from the cowl side junction block RH (main body ECU RH).

OK:
Combination meter indicator dims.
NG -- GO TO LIGHTING SYSTEM
OK -- REPLACE MAYDAY ECU TOGETHER WITH MAYDAY BATTERY AND THEN PERFORM REGISTRATION