SWS DIAGNOSIS
TSB Revision
SIMPLIFIED WIRING SYSTEM (SWS)
54Ba-9
HOW TO CHECK ECUs
M1549014900208
1. Use the scan tool and the SWS monitor kit to
check ECUs. (Refer to MUT-II Reference Manual)
2. The following ECUs can be checked by using the
scan tool and the SWS monitor kit.
NOTE: The "ECU COMM CHK" function checks a
communication status of ECUs "NG" does not
always mean ECU malfunction. If a malfunction is
found by the "ECU COMM CHK," proceed "Symptom
Procedure" (Refer to
P.54Bb-2
).
SWS monitor kit-compatible ECUs and their conditions
NOTE:
.
•
*
1
: If the ignition switch is turned to the "LOCK"
(OFF) or "ACC" when "NG" is displayed beside
the "ETACS ECU" or the signal request line is
abnormal, the scan tool shows "NG" beside the
"COLUMN ECU."
•
*
2
: When "NG" is displayed beside the "ETACS
ECU," the scan tool shows "NG" beside the
"FRONT ECU" and "SUNROOF ECU."
•
*
3
: If "NG" is displayed beside the "COLUMN
ECU," "NG" is displayed on the "CENTER DISP."
SERVICE DATA CHECK
M1549015000208
1. Use the scan tool and the SWS monitor kit to
check "Service Data."
This "Service Data" check is applicable for
signals, which are transmitted and received
through the SWS communication line. For input
signals, which are not compatible with the SWS
monitor kit, refer to the Pulse Check procedure
(by using the scan tool or voltmeter)
P.54Ba-18
.
2. The following input signals can be checked by
using the scan tool and the SWS monitor kit.
NOTE: If a problem is found in the "Service Data"
check, refer to the Problems during Input Signal
Check <SWS monitor>. (Refer to
P.54Bc-2
.)
<DATA LIST REFERENCE TABLE>
• COLUMN ECU (column switch)
ECUs TO BE CHECKED
DISPLAY ON SCAN
TOOL
NORMAL
CONDITION
ECU CONDITION
Column switch (column-
ECU)
COLUMN ECU
OK*
1
All of the column switch, power
supply, ground and interconnecting
communication line are normal
ETACS-ECU
ETACS ECU
OK
All of the ETACS-ECU switch, power
supply, ground and interconnecting
communication line are normal
Front-ECU
FRONT ECU
OK*
2
All of the front-ECU, power supply,
ground and interconnecting
communication line are normal
Sunroof motor assembly
(sunroof-ECU)
SUNROOF ECU
OK*
2
All of the sunroof motor assembly,
power supply, ground and
interconnecting communication line
are normal
RV meter
CENTER DISP.
OK*
3
All of the RV meter, power supply,
ground and interconnecting
communication line are normal
Other SWS-related ECUs
Other ECUs
NG
ECUs are not used