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LV ELECTRICAL SYSTEM
93
20.8 BCM REPLACEMENT STRATEGY
1. Disconnect the battery.
2. Locate the BCM ECU. Refer for location of the
BCM.
3. Remove all the BCM ECU connectors. (Refer
image in case Base BCM / Mid BCM)
4. Remove the old BCM ECU from bracket.
5. Fix the new BCM ECU on bracket.
6. Connect all the BCM ECU connectors into their
respective sockets. (Refer image in case Base
BCM /Mid BCM)
7. Ensure that all connectors are fitted tightly and
properly.
8. Connect the battery.
9. Connect the diagnostic tool to OBD connector.
10.Turn the IGN ON.
11.Read the DTCs and clear all the DTCs from
BCM ECU with the help of diagnostic tool.
12.Unlock security to BCM ECU. Please follow
the procedure available in service tool to
unlock the security access.
Caution
– This is an essential step without
unlocking the security access further steps will
not be executed.
13.Perform the following diagnostics activities
a.
Read HW, SW part numbers and it’s version
numbers of BCM ECU and compare against
server
i. Vehicle Manufacturer Spare Part Number
(F187)
ii. ECU Application Software Number (7241)
iii. Application Software Identification (F181)
iv. ECU Calibration Software Number (7242)
b.
If upgrade required or mismatch with part
numbers, then flash the BCM ECU with latest
software. Afterwards follow the above step
again.
14.Learn the RKE (remote key) as per below
mentioned procedure
a.
Unlock the vehicle and open the driver door.
b.
Turn ON->OFF->ON Ignition 6 times within 6
seconds and observe flasher feedback. Two
flashes of Left - Right indicator Lamps and
Telltale outputs that indicates BCM entered
into Remote key learn mode.
c.
During 10 seconds time period, press both
Lock and Unlock buttons of Remote Key
simultaneously.
d.
BCM shall flash Left - Right indicator lamp
and Telltale twice. In parallel, doors get
locked and unlocked.
e.
Learn next Remote Key as per steps c and d,
if required.
Note:
Maximum four keys can be learned.
f.
On exiting learning mode, BCM shall give
single long flash.
15.Update BCM ECU VIN with following
procedure
a.
Turn the IGN ON again and Unlock security
to BCM ECU with the help of diagnostic tool.
b.
Read VIN from BCM ECU (22 F1 90)
c.
Write correct VIN in BCM ECU (2E F1 90 XX
XX . . . . . )
d.
Read VIN from BCM ECU (22 F1 90) and
verify.
16.Configure the BCM ECU (parameterization of
BCM ECU) with following steps
a.
Turn the IGN ON again and Unlock security
to BCM ECU.
b.
Perform the parameterization as per vehicle
variant with the help of diagnostic tool.
c.
Power Latch - Ignition->OFF->ON transition.
(Make sure is key is taken out).
d.
Read and confirm configuration data from
BCM against server.
17.Read the DTCs and clear all the DTCs from
BCM ECU with the help of diagnostic tool.
18.Provide IGN off-on cycle.
19.Read the DTCs from BCM ECU with the help
of diagnostic tool. If any DTC is present follow
the respective troubleshooting procedure to
rectify it.
20.Execute Service Test Routine for BCM ECU
a.
Execute BCM EOL Self-test routine (31 01
20 01)
b.
Read the DTCs from BCM ECU with the help
of diagnostic tool. If any DTC is present
follow the respective troubleshooting
procedure to it.
c.
Execute Input switch test routine (31 01 34
09 06)
d.
Read Input switch test routine results with the
help of diagnostic tool. If any DTC is present
follow the respective DTC troubleshooting
procedure to rectify it.
MAJOR PRECAUTIONS FOR REPLACEMENT
1. While replacing the BCMs, it is suggested not to
touch the BCM pins with hand.
2. While tightening the screws, tightening torque
must not exceed
3. BCM upper and lower covers shall not be
removed while verifying/replacing the BCM.
4. All of the service tool instructions for BCM
replacement shall be followed.
5. Base and Mid BCMs shall be replaced ONE TO
ONE in place of the faulty parts.