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ELECTRICAL
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28.6 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.METHOD 1 : Learn the RKE/PKE (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.
Method 2 : Learn of RKE/PKE ( Remote key )
through Diagnostic tool
1. After BCM parameterization at EOL/Service the
tool should display message
‘Remote learning initiated’. On the same screen,
EOL/Service tool to prompt for ‘
enter number of
keys to be learnt
’ (Tool should not have an option
to operator at present. To start with, tool should
display “default 2 keys to be paired”. If required
more than 2keys to be paired, Tool shall unmask
this option upon specific request and allow user to
enter the no. of keys start routine request as per
table).
2. BCM shall erase the paired keys data from
memory, whenever this routine is initiated by the
EOL/Service tool to BCM.
3. BCM shall store temporarily the number of keys
to be paired in routine request and shall compare
every time before each key pairing is started till
the requested no. of keys in the start routine and
the pairing request keys through Lock and Unlock
press. If BCM receives number which is not valid
then it update the same as “0x00 -- Not paired” in
routine results response to the tool and exit from
the routine. Tool shall read the same and update
in the display to the users ‘
key learning failed
’ and
shall stop further actions.
4. Tool should display ‘
please press LOCK and
UNLOCK buttons together on 1st remote
’ and
should wait for timeout (time requested in start
routine for each key pair), after successful pairing
process Tool should display ‘
please press LOCK
and UNLOCK buttons together on 2nd remote
’
and should wait for timeout and then upon routine
results request BCM update and set the additional
data accordingly as mentioned in routine
response additional data table. Time required for
pairing is default 5sec, it is configurable between
min. 2sec and max. 20sec
5.
Routine result response additional data –
- Byte 1
a) BCM shall update this byte “Keys Not paired
(0x00)”, till all keys paired and routine executed
successfully. If BCM is in continuation of routine
execution process then it shall update this byte as
0x00 upon routine result response from tool (i.e.,