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 stored when one of the following occurs: 1) the telephone ECU assembly is malfunctioning; 2) the bus buffer ECU is malfunctioning; 3) the main body ECU is malfunctioning; or 4) the CAN line/wire harness 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 DTCs and wait for 20 seconds Reading and Clearing Diagnostic Trouble Codes.
OK:
DTC 5-1 is not output.
NG -- CHECK FOR DTC
OK -- CLEAR HISTORIC DTC
2. CHECK FOR DTC
(a) Check for DTCs using the Techstream Diagnosis System.
HINT:
The bus buffer ECU is connected to the CAN. Check that there are no CAN communication system DTCs output.

Result





HINT:
"U" codes are CAN communication system codes.

B -- GO TO CAN 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 hazard switch illuminates.
OK:
Hazard switch illuminates.
HINT:
The telephone ECU assembly uses the dimmer switch signal from the main body ECU to judge if communication has stopped.

NG -- GO TO LIGHTING SYSTEM
OK -- Continue to next step.
4. REPLACE TELEPHONE ECU ASSEMBLY TOGETHER WITH MAYDAY BATTERY
NEXT -- PERFORM REGISTRATION