headlights RENAULT SCENIC 2008 J84 / 2.G Engine Compartment Connection Unit Workshop Manual

ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - System operation87G
87G-11V7 MR-372-J84-87G050$110.mif
UPC
Vdiag No.: 48, 4C
5 - Exterior lighting
The Protection and Switching Unit receives lighting requests from the UCH via the multiplex network.
The computer then switches the power relays:
–side lights,
–dipped headlights,
–main beam headlights,
–front fog light.
For the operation of this function and the role of the Protection and Switching Unit in the control of this function,
(see 80D, Lighting).
6 - Wiping - Washing
The Protection and Switching Unit receives wiping requests from the UCH via the multiplex network.
The computer then switches the power relays:
–low or high-speed windscreen wiper,
–headlight washers pump relay.
–The Protection and Switching Unit also receives the windscreen wiper park position signal. Using this signal the
computer can determine whether the blade is jammed, and decide whether to stop the wiper motor to protect it.
For the operation of this function and the role of the Protection and Switching Unit in the control of this function,
(see 85A, W ipers-Washing).
7 - Oil pressure detection
The Protection and Switching Unit receives the oil pressure sensor signal and distributes it over the multiplex
network.
8 - Reverse gear engaged signal
The Protection and Switching Unit receives the reverse gear engaged position sensor signal and distributes it over
the multiplex network.

ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Conformity check87G
87G-61V7 MR-372-J84-87G050$440.mif
UPC
Vdiag No.: 48, 4C
FUNCTION: LIGHTING
SUB-FUNCTION: LIGHTING POWER
NOTESOnly carry out this conformity check after a complete check with the diagnostic tool
(fault reading and configuration checks).
Application conditions: engine stopped, + after ignition feed on.
FunctionParameter or Status
Check or ActionDisplay and Notes Fault finding
Side lightsAC003:Side lightsThis command
switches on the side
lights.In the event of a fault, apply the
procedure for dealing with
command AC003.
Dipped
headlightsAC002:Dipped
headlightsThis command
switches on the dipped
beam headlights.In the event of a fault, apply the
procedure for dealing with
command AC002.
Main beam
headlightsAC001:Main beam
headlightsThis command
switches on the main
beam headlights.In the event of a fault, apply the
procedure for dealing with
command AC001.
Front fog lightsAC004:Front fog lightsThis command
switches on the front
fog lights.In the event of a fault, apply the
procedure for dealing with
command AC004.

ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Interpretation of statuses87G
87G-69V7 MR-372-J84-87G050$550.mif
UPC
Vdiag No.: 48, 4C
ET023
ALTERNATOR THERMAL FAULT
NOTESSpecial notes:
Apply the checks if the status is PRESENT with the engine running.
Switch off the engine.
Check the general condition of the alternator:
Make sure that there are no foreign bodies that could impair the alternator cooling.
Clean the alternator if necessary.
With the engine stopped, let the alternator cool down with the bonnet open for at least 1 hour.
Start the engine with the bonnet closed.
Switch on the main beam headlights and the electrical heated rear screen.
If the status becomes PRESENT again, replace the alternator (see MR 364 or MR 370 Mechanical, 16A,
Starting - Charging, Alternator: Removal - Refitting).
AFTER REPAIRRepeat the conformity check from the start.
USM_V48_ET023 /USM_V4C_ET023

ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Interpretation of parameters87G
87G-72V7 MR-372-J84-87G050$660.mif
UPC
Vdiag No.: 48, 4CENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Interpretation of parameters
PR004
BATTERY VOLTAGE
NOTESSpecial notes:
Check that all of the electrical consumers are switched off:
–Passenger compartment blower unit stopped.
–Radio off (and Radio navigation system if fitted to the vehicle).
–Interior lights off.
If fault DF013 Voltage regulation is not present (or stored):
With the engine stopped and no electrical consumers operating for 5 minutes.
Check the battery, see TEST3 Battery status test.
If fault DF013 Voltage regulation is present:
With the engine running at idle speed, and electrical consumers activated:
–Dipped headlights and side lights.
–Electric heated rear screen.
–Passenger compartment blower unit in maximum position.
Check the consistency between the battery voltage measurement from the multimeter and the value of PR004
Battery voltage.
If the difference is greater than 1 V check the conformity of the Protection and Switching Unit supply circuit and
the charging circuit wiring TEST2 Wiring test.
Repair if necessary, otherwise replace the Protection and Switching Unit (see Replacement of components).
AFTER REPAIRRepeat the conformity check from the start.
USM_V48_PR004 /USM_V4C_PR004
MR-372-J84-87G050$660.mif

ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Interpretation of parameters87G
87G-74V7 MR-372-J84-87G050$660.mif
UPC
Vdiag No.: 48, 4C
PR010
ALTERNATOR CHARGE
NOTESIf fault DF007 UPC-alternator connection is declared present, deal with this fault first.
Start the engine and let it idle for 5 minutes.
Check that the fan units are not running.
Without any electrical consumers switched on, check the value of PR010 Alternator charge.
PR010 decreases and is < 50 % after a few minutes.
"YES"
No interfering consumer is disturbing vehicle operation.
–Switch on the electric heated rear screen and the main beam headlights.
–Wait 20 seconds and then check that PR010 Alternator charge has increased but
remains less than 90%.
If PR010 Alternator charge remains stuck at 99.6%, replace the alternator (see MR 364
or MR 370 Mechanical, 16A, Starting - Charging, Alternator: Removal - Refitting).
PR010 remains > 50% after 20 minutes.
–See 16A, Starting - Charging, Alternator output.
"NO"
AFTER REPAIRRepeat the conformity check from the start.
USM_V48_PR010 /USM_V4C_PR010

ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Command summary table87G
87G - 75V7 MR-372-J84-87G050$715.mif
UPC
Vdiag No.: 48, 4CENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Command summary table
Tool command Diagnostic tool title
AC001Main beam headlights
AC002Dipped headlights
AC003Side lights
AC004Front fog lights
AC005Low-speed windscreen wiper
AC006High-speed windscreen wiper
AC008Compressor control
AC009Low-speed fan assembly
AC010High-speed fan assembly
AC011Rear screen de-icer
AC013Headlight washers relay
AC014Alternator regulation
AC016Test electrical supply circuits
MR-372-J84-87G050$715.mif

ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Interpretation of commands87G
87G - 76V7 MR-372-J84-87G050$770.mif
UPC
Vdiag No.: 48, 4C ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Interpretation of commands
AC001
MAIN BEAM HEADLIGHTS
NOTESSpecial notes:
Check the condition and connections of fuses 6 (10A) and 7 (10A) on the Protection
and Switching Unit. Replace them if necessary.
Check the condition and connections of the bulbs. Replace them if necessary.
Use Wiring Diagrams Technical Note for Mégane II or Scénic II.
Check the condition and connection of the headlights, component codes 226 and 227 (tabs bent, broken or
oxidised).
If the connectors are faulty and if there is a repair procedure (see Technical Note 6015A, Repairing electrical
wiring, Wiring: Precautions for repair), repair the connector, otherwise replace the connector.
Check for earth, connection code MAS for the headlights, component codes 226 and 227.
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 headlight connection codes RPD and RPG whilst running the command.
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.
Check the condition and connection of the Protection and Switching Unit 8-track AN connector, connection
code 1337 (tabs broken, bent 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 insulation, continuity and the absence of interference resistance on the following connections:
–RPD, between components 1337 and 226,
–RPG between components 1337 and 227.
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.
MR-372-J84-87G050$770.mif

ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Interpretation of commands87G
87G - 77V7 MR-372-J84-87G050$770.mif
UPC
Vdiag No.: 48, 4C
AC002
DIPPED HEADLIGHTS
NOTESSpecial notes:
Check the condition and connections of fuses 3 (10A) and 4 (10A) on the Protection
and Switching Unit. Replace them if necessary.
Check the condition and connections of the bulbs. Replace them if necessary.
Use Wiring Diagrams Technical Note for Mégane II or Scénic II.
Check the condition and connection of the headlights, component codes 226 and 227 (tabs bent, broken or
oxidised).
If the connectors are faulty and if there is a repair procedure (see Technical Note 6015A, Repairing electrical
wiring, Wiring: Precautions for repair), repair the connector, otherwise replace the connector.
Check for earth, connection code MAS for the headlights, component codes 226 and 227.
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 headlight connection codes CPD and CPG whilst running the command.
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 Protection and Switching Unit 8-track AN connector, connection
code 1337 (tabs broken, bent 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 insulation, continuity and the absence of interference resistance on the following connections:
–CPD, between components 1337 and 226,
–CPG between components 1337 and 227.
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 - Interpretation of commands87G
87G - 78V7 MR-372-J84-87G050$770.mif
UPC
Vdiag No.: 48, 4C
AC003
SIDE LIGHTS
NOTESSpecial notes:
Check the condition and connections of fuses 1 (7.5A) and 2 (7.5A) on the Protection
and Switching Unit. Replace them if necessary.
Check the condition and connections of the bulbs. Replace them if necessary.
Use Wiring Diagrams Technical Note for Mégane II or Scénic II.
Check the condition and connection of the headlights, component codes 226 and 227 (tabs bent, broken or
oxidised).
If the connectors are faulty and if there is a repair procedure (see Technical Note 6015A, Repairing electrical
wiring, Wiring: Precautions for repair), repair the connector, otherwise replace the connector.
Check for earth, connection code MAS for the headlights, component codes 226 and 227.
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 side light connection codes LPD and LPG whilst running the command.
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 Protection and Switching Unit 8-track AN connector, connection
code 1337 (tabs broken, bent 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 insulation, continuity and the absence of interference resistance on the following connections:
–LPD, between components 1337 and 226,
–LPG, between components 1337 and 227.
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 - Interpretation of commands87G
87G - 79V7 MR-372-J84-87G050$770.mif
UPC
Vdiag No.: 48, 4C
AC004
FRONT FOG LIGHTS
NOTESSpecial notes:
Use this command only for vehicles fitted with front fog lights.
Check the condition and connection of fuse 5 (20A) on the Protection and Switching
Unit. Replace it if necessary.
Check the condition and connection of the bulbs. Replace them if necessary.
Use Wiring Diagrams Technical Note for Mégane II or Scénic II.
Check the condition and connection of the fog lights, component codes 176 and 177 (tabs bent, broken or
oxidised).
If the connectors are faulty and if there is a repair procedure (see Technical Note 6015A, Repairing electrical
wiring, Wiring: Precautions for repair), repair the connector, otherwise replace the connector.
Check for earth connection code MAS on the headlights, component codes 176 and 177.
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 codes 8E and 8F for the fog lights whilst running the command.
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 Protection and Switching Unit 8-track AN connector, connection
code 1337 (tabs broken, bent 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 insulation, continuity and the absence of interference resistance on the following connections:
–8E, between components 1337 and 177,
–8F, between components 1337 and 176.
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.