MMCS
TSB Revision
CHASSIS ELECTRICAL
54A-433
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827 M.U.T.-III USB Cable
• MB991910 M.U.T.-III Main Harness A
STEP 1. Perform "Vehicle Signal Check" in the MMCS
service mode.
Perform "Vehicle Signal Check" in the MMCS service mode to
check whether vehicle speed signal is normal (Refer to
P.54A-369
).
Q: Is the vehicle speed signal transmitted normally?
YES : Replace the multivision display.
NO : Go to Step 2.
STEP 2. Check the speedometer.
Check whether the speedometer works normally.
Q: Does the speedometer work normally?
YES : Go to Step 3.
NO : Diagnose the combination meter (Refer to
Combination meter
− Troubleshooting
P.54A-59
).
STEP 3. Check combination meter connector C-04 and
multivision display connector C-13 for loose, corroded or
damaged terminals, or terminals pushed back in the
connector.
Q: Is combination meter connector C-04 and multivision
display connector C-13 in good condition?
YES : Go to Step 4.
NO : Repair or replace the damaged component (Refer to
GROUP 00E, Harness Connector Inspection
P.00E-2
).
STEP 4. Check the wiring harness between combination
meter connector C-04 (terminal 20) and multivision display
connector C-13 (terminal 13).
• Check the communication lines for open circuit and short
circuit..
NOTE: Also check intermediate connector C-108 for loose, cor-
roded, or damaged terminals, or terminals pushed back in the
connector. If intermediate connector C-108 is damaged, repair
or replace the connector as described in GROUP 00E, Harness
Connector Inspection
P.00E-2
.
Q: Is the wiring harness between combination meter
connector C-04 (terminal 20) and multivision display
connector C-13 (terminal 13) in good condition?
YES : Go to Step 5.
NO : The wiring harness may be damaged or the
connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary.