Removing and installing battery regulation control unit J840 — VW

Removing and installing
battery regulation control unit
J840
Battery regulation control unit
J840
is installed in
connection and distribution box
SX1
(electronics box) on side of
hybrid battery unit
AX1
.
Removing:
WARNING
Observe general warning instructions for work on the high-voltage system
Chapter
High voltage at
connection and distribution box
SX1
(electronics box)!
Health risks for persons wearing medical devices.
Severe burns or death.
Work on the
battery regulation control unit
J840
may only be carried out by a high-voltage technician.
Always use insulated tools when working on the
battery regulation control unit
J840
.
Note
If
battery regulation control unit
J840
is renewed, coding must be read out from old control unit prior to removal
Chapter
.
WARNING
High-voltage in the hybrid vehicle's high-voltage system. Danger of electric shock! Work on the high-voltage system is also necessary for the following work sequence. Now de-energise the high-voltage system
Chapter
.
De-energising the high-voltage system
Chapter
Removing
hybrid battery unit
AX1
Chapter
.
Unscrew 8 securing bolts
1
and remove cover of
connection and distribution box
SX1
(electronics box).
Loosen both securing bolts
2
from maintenance connector mounting.
Separate cable tie
arrow
for electrical cable.
Release and separate 3 connectors
1
,
2
and
3
at
battery regulation control unit
J840
.
Unscrew both securing bolts
3
from
battery regulation control unit
J840
using a magnetic and insulated tool.
Raise
battery regulation control unit
J840
and release and separate connectors
4
and
5
.
Lift
battery regulation control unit
J840
upwards out of electronics box.
If
battery regulation control unit
J840
is renewed, release and separate connector
6
at
battery regulation control unit
J840
and remove together with wiring harness.
Installing:
Insert connector
6
with wiring harness until it is felt to engage.
Insert
battery regulation control unit
J840
into electronics box and insert both connectors
4
and
5
until they are felt to engage.
Position
battery regulation control unit
J840
in electronics box.
Tighten earth cable (terminal) to
battery regulation control unit
J840
in electronics box.
Tighten
battery regulation control unit
J840
and earth cable using two securing bolts
3
.
Tighten mounting for maintenance connector using two securing bolts
2
.
Insert connectors
1
,
2
and
3
into
battery regulation control unit
J840
until they are felt to engage.
Secure electrical cable with a cable tie
arrow
again.
Before positioning cover for electronics box, check routing of electronics box wiring harness lines.
Note
Rubber grommet of wiring harness
arrow
must be attached properly in electronics box housing.
Position electronics box cover and tighten with the 8 securing bolts
1
.
Installing
hybrid battery unit
AX1
Chapter
.
Re-energising the high-voltage system and documentation
Chapter
.