Mitsubishi Lancer (4A9 engine). Manual — part 232
SECURITY ALARM
CHASSIS ELECTRICAL
54A-590
SECURITY ALARM
SPECIAL TOOLS
M1547000600305
SECURITY ALARM
CHASSIS ELECTRICAL
54A-591
Tool
Number
Name
Use
MB990784
Ornament
remover
Removal of centre air outlet, centre
panel
MB990784
SECURITY ALARM
CHASSIS ELECTRICAL
54A-592
MB991955
a. MB991824
b. MB991827
c. MB991910
d. MB991911
e. MB991825
f. MB991826
M.U.T.-III sub-
assembly
a. Vehicle
Communicatio
n Interface
(V.C.I.)
b. M.U.T.-III USB
cable
c. M.U.T.-III main
harness A
(Vehicles with
CAN
communication
system)
d. M.U.T.-III main
harness B
(Vehicles
without CAN
communication
system)
e. M.U.T.-III
measure
adapter
f. M.U.T.-III
trigger harness
CAUTION
For vehicles with CAN
communication, use M.U.T.-III
main harness A to send simulated
vehicle speed. If you connect
M.U.T.-III main harness B instead,
the CAN communication does not
function correctly.
Diagnosis code, service data and
actuator test check.
MB991223
a. MB991219
b. MB991220
c. MB991221
d. MB991222
Harness set
a. Check harness
b. LED harness
c. LED harness
adapter
d. Probe
Continuity check and voltage
measurement at harness wire or
connector
a. For checking connector pin
contact pressure
b. For checking power supply circuit
c. For checking power supply circuit
d. For connecting a locally sourced
tester
Tool
Number
Name
Use
MB991910
MB991826
MB991955
MB991911
MB991824
MB991827
MB991825
a
b
c
d
e
f
DO NOT USE
MB991223
a
d
c
b
DO NOT USE
BA
SECURITY ALARM
CHASSIS ELECTRICAL
54A-593
TROUBLESHOOTING
STANDARD FLOW OF DIAGNOSTIC
TROUBLESHOOTING
M1547001200076
Refer to GROUP 00
− Contents of troubleshooting .
DIAGNOSIS FUNCTION
M1547001300073
HOW TO READ DIAGNOSIS CODE
Refer to GROUP 00
− Diagnosis function .
HOW TO ERASE DIAGNOSIS CODE
Refer to GROUP 00
− Diagnosis function .
DIAGNOSIS CODE CHART
M1547001400188
DIAGNOSIS CODE PROCEDURES
Code No.B120A Security alarm siren error
CAUTION
Before replacing the ECU or sensor, ensure that the power supply circuit, the earth circuit and the
communication circuit are normal.
DIAGNOSTIC FUNCTION
• The security alarm siren communicates with the
ETACS-ECU by the LIN via the LIN cutoff control
unit. The diagnosis code No. B120A is set if the
communication data between the EATCS-ECU
and security alarm siren has an error when the
relay inside the LIN cutoff control unit is ON
(alarm is not activated.)
TROUBLESHOOTING HINT
Malfunction of security alarm siren
MB992006
Extra fine probe
Continuity check and voltage
measurement at harness wire or
connector
Tool
Number
Name
Use
MB992006
Diagnosis code No.
Diagnostic item
Reference page
B120A
Security alarm siren error
B120B
Security alarm sensor error
B120C
Security alarm siren Flat Battery
U1006
Security alarm siren LIN timeout
Refer to GROUP 54B -
Diagnosis code chart
U1007
Security alarm sensor LIN timeout
Refer to GROUP 54B -
Diagnosis code chart
U1539
Security alarm siren LIN checksum error
Refer to GROUP 54B -
Diagnosis code chart
U1540
Security alarm SNSR.LIN checksum error
Refer to GROUP 54B -
Diagnosis code chart
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