wiring RENAULT SCENIC 2008 J84 / 2.G Engine Compartment Connection Unit Repair Manual

ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Interpretation of commands87G
87G - 85V7 MR-372-J84-87G050$770.mif
UPC
Vdiag No.: 48, 4C
AC011
HEATED REAR SCREEN
NOTESSpecial notes:
Check the condition and connection of fuse 23 (30A) on the Protection and Switching
Unit. Replace it if necessary.
Use Wiring Diagrams Technical Note for Mégane II or Scénic II.
REAR SCREEN
Check the condition and connection of the heated rear screen component code 200 (tabs bent, broken or
oxidised).
If the connector is faulty and there is a repair procedure (see Technical Note 6015A, Electrical wiring repair,
Wiring: Precautions for repair), repair the connector, otherwise replace the connector.
Check that the resistance of the rear screen is neither zero nor infinity.
Check that the earth on connection code MZ of the heated rear screen component code 200 is perfect.
If the connection is faulty and there is a repair procedure (see Technical Note 6015A, Electrical wiring repair,
Wiring: Precautions for repair), repair the wiring, otherwise replace it.
Check for + 12 V on connection code 15LP on the rear screen when the command is running.
If the connection is faulty and there is a repair procedure (see Technical Note 6015A, Electrical wiring repair,
Wiring: Precautions for repair), repair the wiring, otherwise replace it.
Check the condition and connection of the 6-track Protection and Switching Unit CM connector (tabs broken, bent
oxidised).
If the connector is faulty and there is a repair procedure (see Technical Note 6015A, Electrical wiring repair,
Wiring: Precautions for repair), repair the connector, otherwise replace the connector.
Check the insulation, continuity and the absence of interference resistance on the following connection:
–15LP, between components 1337 and 200.
If the connection is faulty and there is a repair procedure (see Technical Note 6015A, Electrical wiring repair,
Wiring: Precautions for repair), repair the wiring, otherwise replace it.
If the fault is still present, contact Techline.
AFTER REPAIRRepeat the conformity check from the start.

ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Interpretation of commands87G
87G - 86V7 MR-372-J84-87G050$770.mif
UPC
Vdiag No.: 48, 4C
AC013
HEADLIGHT WASHER RELAY
NOTESSpecial notes:
Check the condition and connection of fuse 21 (15A) on the Protection and
Switching Unit. Replace it if necessary.
The headlight washer pump operates if the dipped headlights are lit and the
windscreen washer switch is pressed and held.
Use Wiring Diagrams Technical Note for Mégane II or Scénic II.
Check the condition and connection of the headlight washer pump component code 219 (tabs bent, broken or
oxidised).
If the connector is faulty and there is a repair procedure (see Technical Note 6015A, Electrical wiring repair,
Wiring: Precautions for repair), repair the connector, otherwise replace the connector.
Check the condition and connection of the Protection and Switching Unit connector (tabs bent, broken, or
oxidised).
If the connector is faulty and there is a repair procedure (see Technical Note 6015A, Electrical wiring repair,
Wiring: Precautions for repair), repair the connector, otherwise replace the connector.
To check that the pump is working properly, supply the pump's tracks directly in one direction and then the other.
If the pump does not rotate, replace it.
Check for + 12 V alternately on connection code 39C of the headlight washer pump connector.
If the connection is faulty and there is a repair procedure (see Technical Note 6015A, Electrical wiring repair,
Wiring: Precautions for repair), repair the wiring, otherwise replace it.
Check the insulation, continuity and the absence of interference resistance on the following connections:
–39A, between components 1337 and 219,
–39C, between components 1337 and 219.
If the connections are faulty and there is a repair procedure (see Technical Note 6015A, Electrical wiring repair,
Wiring: Precautions for repair), repair the wiring, otherwise replace it.
If the fault is still present, contact Techline.
AFTER REPAIRRepeat the conformity check from the start.

ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Fault finding charts87G
87G-90V7 MR-372-J84-87G050$880.mif
UPC
Vdiag No.: 48, 4CENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Fault finding charts
ALP1 No dialogue with the computer
NOTESRun a complete multiplex network check using the diagnostic tool.
Check the condition and connection of the connectors and fuses on the Protection
and Switching Unit.
Use Wiring Diagrams Technical Note for Mégane II or Scénic II.
Try the tool on another vehicle.
Check the voltage of the battery.
Check the condition and connection of the battery fuse box fuses and terminals.
Replace the defective fuse.
If the connection is defective and there is a repair method (see Technical Note 6015A, Electrical wiring repair,
Wiring: Precautions for repair), repair the wiring, otherwise replace it.
Check for + 12 V on the screwed-in power terminal of the Protection and Switching Unit.
If the connection is defective and there is a repair method (see Technical Note 6015A, Electrical wiring repair,
Wiring: Precautions for repair), repair the wiring, otherwise replace it.
Check for earth on connection codes MAS and NAM of connector CM of the Protection and Switching Unit,
component code 1337.
If any of the connections are defective and there is a repair procedure (see Technical Note 6015A, Electrical
wiring repair, Wiring: Precautions for repair), repair the wiring, otherwise replace it.
Check for a + 12 V battery on connection code BP32, + 12 V APC on connection code AP43 and an earth on
connection codes NAM and MAM of the diagnostic socket.
If any of the connections are defective and there is a repair procedure (see Technical Note 6015A, Electrical
wiring repair, Wiring: Precautions for repair), repair the wiring, otherwise replace it.
If dialogue with the computer is still not possible, contact the Techline.
AFTER REPAIRCheck that no fault is present.
USM_V48_ALP1 /USM_V4C_ALP1
MR-372-J84-87G050$880.mif

ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Fault finding charts87G
87G-91V7 MR-372-J84-87G050$880.mif
UPC
Vdiag No.: 48, 4C
ALP3No backlighting of the various functions in the passenger
compartment
NOTESMake sure that the side lights are working; if not, refer to the procedure for command
AC003 Side lights.
Use Wiring Diagrams Technical Note for Mégane II or Scénic II.
Check the condition and connection of the defective functions.
If the connector is faulty and there is a repair procedure (see Technical Note 6015A, Electrical wiring repair,
Wiring: Precautions for repair), repair the connector, otherwise replace the connector.
Check for earth on the defective function(s).
If the connection is faulty and there is a repair procedure (see Technical Note 6015A, Electrical wiring repair,
Wiring: Precautions for repair), repair the wiring, otherwise replace it.
With the side lights on, check for 12 V on the defective function(s).
If correct, replace the defective component.
If the connection is faulty and there is a repair procedure (see Technical Note 6015A, Electrical wiring repair,
Wiring: Precautions for repair), repair the wiring, otherwise replace it.
Check the insulation, continuity, and the absence of interference resistance between the defective function
and the Protection and Switching Unit:
Right-hand headlight component code 226, rear right-hand
lights component code 172, right-hand and left-hand heated
seat control component codes 1513 and 1514, parking distance
control switch component code 1540, cruise control/speed
limiter control component code 1081, ESP on/off button
component code 1106, gear lever display component code
1129, hard roof switch component code 1482, simultaneous
window control component code 854, LPG or petrol selector
switch component code 1003, right-hand number plate light
component code 166.LPDConnector CN of the
Protection and Switching
Unit, component code
1337.
Left-hand rear light component code 173, left-hand headlight
component code 227, child safety switch component code 135,
CD changer component code 1272, radio component code
261, multifunction display component code 653, headlight
adjustment rheostat switch component code 1390, warning/door
locking switch component code 1391, first cigarette lighter
component code 101.LPGConnector CN of the
Protection and Switching
Unit, component code
1337.
If the connections are faulty and there is a repair procedure (see Technical Note 6015A, Electrical wiring repair,
Wiring: Precautions for repair), repair the wiring, otherwise replace it.
If the fault is still present, contact the Techline.
AFTER REPAIRCheck that no fault is present.
USM_V48_ALP3 /USM_V4C_ALP3

ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Tests87G
87G-92V7 MR-372-J84-87G050$935.mif
UPC
Vdiag No.: 48, 4CENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Tests
Some specific checks are grouped together into Tests and are performed as required in:
–Introduction.
–Interpretation of faults.
–Interpretation of parameters.
WIRING HARNESS CHECK TEST1
MR-372-J84-87G050$935.mif

ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Tests87G
87G-93V7 MR-372-J84-87G050$935.mif
UPC
Vdiag No.: 48, 4C
TEST1 Wiring check
Check the condition of the battery terminals.
Check that there is no corrosion on the
battery terminals. Check that the terminals
are correctly tightened (see MR 364 or
MR 370 Mechanical, 80A, Battery,
Battery: Removal - Refitting).
Clean the terminals and posts or replace them, if
necessary Are the terminals and posts in good
condition and not corroded?
Check that there are no electrolyte leaks
from the battery (cracks or breakage).
Check that the battery is correctly fitted
mechanically (see MR 364 or MR 370
Mechanical, 80A, Battery, Battery:
Removal - Refitting).
Replace the battery if necessary and clean the
surrounding area in the vehicle (see MR 364 or
MR 370 Mechanical, 80A, Battery, Battery:
Removal - Refitting). Is the battery in good condition?
With the engine stationary, check that all
the wires connecting the battery to the
starter are in good condition, and that their
terminals are correctly tightened and
secure.
Repair the damaged wires and terminals. If the
connection is faulty and if there is a repair
procedure (see Technical Note 6015A, Electrical
wiring repair, Wiring: Precautions for repair),
repair the wiring, otherwise replace the wiring. Are the connections in good condition?
NO
YES
NO
YES
NO
YES
A
AFTER REPAIRCarry out a complete check with the diagnostic tool.
USM_V48_TEST1/USM_V4C_TEST1

ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Tests87G
87G-94V7 MR-372-J84-87G050$935.mif
UPC
Vdiag No.: 48, 4C
TEST1
CONTINUED
With the engine running, main beam
headlights and heated rear screen on,
measure the voltage between the B+
battery feed and B+ alternator feed
Check the condition of all the wires connecting the
battery, alternator and starter and that all of their
terminals are correctly tightened. Is the voltage > 0.7 V?
Repair any damaged wires and terminals. If the
connection is faulty and if there is a repair
procedure (see Technical Note 6015A Electrical
wiring repair, Wiring: Precautions for repair),
repair the wiring, otherwise replace the wiring
With the engine running, main beam
headlights and heated rear screen on,
measure the voltage between the B- battery
feed and the alternator frame.Check the earths for the engine, the alternator, the
chassis, the gearbox, the battery or the starter
(check for tightness, check the condition of the
terminals and the condition of the wires) (see
Technical Note for the relevant vehicle). Is the voltage > 0.7 V?
Repair any damaged wires and terminals. If the
connection is faulty and if there is a repair
procedure (see Technical Note 6015A Electrical
wiring repair, Wiring: Precautions for repair),
repair the wiring, otherwise replace the wiring The electrical circuit is in good order.
A
YES
YES
NO
YES
NO
AFTER REPAIRCarry out a complete check with the diagnostic tool.