SWS ± Troubleshooting
54B-10
Code No.21 Short circuit in communication lines Probable cause
This diagnosis code is displayed when the SWS communication line voltage
reaches the LO level for 0.3 second. The diagnosis code is erased when
voltage in the ETACS-ECU data line reaches the HI level for 0.3 second, or
the ETACS-ECU receives a normal signal from other ECUs or switches. While
this code is displayed, other codes are not displayed.
D Malfunction of column switch
D Malfunction of front-ECU
D Malfunction of power window main switch
<vehicles with front power window>
D Malfunction of multi center display <vehicles with
multi center display>
D Malfunction of ETACS-ECU
D Malfunction of wiring harness or connector
Check the following connectors:
A-38X, C-53, C-63, C-83, E-10
NG
Repair
OK
Check trouble symptoms.
NG
Check the harness wires between column switch and ETACS-ECU,
front-ECU and ETACS-ECU, power window main switch and
ETACS-ECU, multi-center display and ETACS-ECU.
NG
Repair
OK
Is diagnosis code No. 21 no longer output when column
switch connector C-63 is disconnected? (However, code No.
12 is still output.)
Yes
Replace the column switch.
No
Is diagnosis code No. 21 no longer output when front-ECU
connector A-38X is disconnected? (However, code No. 13 is
still output.)
Yes
Replace the front-ECU.
No
Is diagnosis code No. 21 no longer output when power
window main switch connector E-10 is disconnected?
Yes
Replace the power window main switch.
No
Is diagnosis code No. 21 no longer output when multi-center
display connector C-53 is disconnected?
Yes
Replace the multi center display.
No
Replace the ETACS-ECU.
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