headlights RENAULT SCENIC 2010 J95 / 3.G Engine Compartment Connection Unit Workshop Manual

87G - 2
ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Introduction
87G
V6 MR-372-J84-87G000$066_eng.mif
187G
UPC
Vdiag No.: 44ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Introduction
1. SCOPE OF THIS DOCUMENT
This document presents the fault finding procedure applicable to all computers with the following specifications:
2. PREREQUISITES FOR FAULT FINDING
Documentation type
Fault finding procedures (this manual):
–Assisted fault finding (integrated into the diagnostic tool), Dialogys.
Wiring diagrams:
–Visu-Schéma (CD-ROM), paper version.
Type of diagnostic tools
–CLIP
Special tooling required
3. RECAP
Procedure
To run diagnostics on the vehicle's computers, switch on the ignition in fault finding mode (forced + after ignition
feed).
Proceed as follows:
–insert the vehicle card in the card reader,
–press and hold Start button (longer than 5 seconds) with start conditions not fulfilled,
–connect the diagnostic tool and perform the desired operations.
To turn off the + APC feed proceed as follows:
–disconnect the diagnostic tool,
–press the Start button twice briefly (less than 3 seconds),
–check that the + APC has been turned off by the computer indicator lights on the instrument panel
being switched off. Vehicle(s): MEGANE II, SCENIC II
Function concerned: UPCName of computer: UPC
VDIAG No.: 44
Special tooling required
Multimeter
Universal bornier
Note:
The left-hand and right-hand xenon lamp computers are powered when the dipped beam headlights light up. It will
therefore not be possible to run fault finding on them until the ignition has been switched on in fault finding mode
(forced + APC) and the dipped beam headlights have been switched on.
MR-372-J84-87G000$066_eng.mif

87G - 8
ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - System operation
87G
V6 MR-372-J84-87G000$132_eng.mif
UPC
Vdiag No.: 44
Front wipers
The UPC receives the wiping requests from the UCH via the multiplex network.
The computer then controls the following requests:
–low or high speed windscreen wiper,
–windscreen wiper park position.
Lights
The UPC receives the lighting requests from the UCH via the multiplex network.
The computer then controls the following requests:
–side lights,
–dipped beam headlights,
–main beam headlights,
–front fog light.
Detecting the oil pressure
The UPC receives the signal from the oil pressure sensor and makes it available on the multiplex network.
2. UPC LEVELS
3 UPC levels can be fitted on vehicles:
–Entry level UPC,
–Top of the range UPC N2,
–Top of the range UPC N3.
Only the top of the range N2 and N3 UPCs are available as spare parts.
The N2 and N3 versions can be distinguished in the extent to which they control the high speed blower:
–on the N2, the UPC controls an external relay,
–on N3, the relay is integrated into the UPC.

87G - 20
ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Conformity check
87G
V6 MR-372-J84-87G000$528_eng.mif
UPC
Vdiag No.: 44
LIGHTING: Lighting power
NOTESOnly check conformity after a complete check using the diagnostic tool.
Test conditions: Engine stopped, ignition on.
Order FunctionParameter or Status
checked or Action Display and notes Fault finding
1LightingAC003:Side lightsThe front and rear side
lights and the number
plate lights as well as
the controls and
switches in the
passenger
compartment must
light up.
Refer to the relevant fault
finding procedure in the
event of a fault.
AC002:Dipped beam
headlightsThe dipped beam
headlights must come
on.
AC001:Main beam
headlightsThe main beam
headlights must come
on.
AC004:Front fog lightsThe front fog lights
must come on.

87G - 25
ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Conformity check
87G
V6 MR-372-J84-87G000$528_eng.mif
UPC
Vdiag No.: 44
LIGHTING: Lighting power
NOTESOnly check conformity after a complete check using the diagnostic tool.
Condition for carrying out the operation: the engine must be running.
Order FunctionParameter or Status
checked or Action Display and notes Fault finding
1LightingAC003:Side lightsThe front and rear side
lights and the number
plate lights as well as
the controls and
switches inside the
passenger
compartment must
light up.
Refer to the relevant fault
finding procedure in the
event of a fault.
AC002:Dipped beam
headlightsThe dipped beam
headlights must come
on.
AC001:Main beam
headlightsThe main beam
headlights must come
on.
AC004:Front fog lightsThe front fog lights
must come on.

87G - 36
ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Interpretation of commands
87G
V6 MR-372-J84-87G000$792_eng.mif
UPC
Vdiag No.: 44ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Interpretation of commands
Without xenon lights AC001
MAIN BEAM HEADLIGHTS
NOTESCheck:
–the status and the connection of fuses 8A and 8B on the UPC,
–the status of the bulbs.
Replace them, if necessary.
Check the status and the connection of connector PPA and the fuses on the UPC.
Repair if necessary.
Check the condition and connection of the headlight connectors.
Repair if necessary.
Check the presence of earth on the connection R9 and then on track 1 of the headlight connector.
Repair if necessary.
Check the presence of +12 V on track 4 of the headlights when these are controlled by command AC001.
If everything is fine, replace the bulbs.
If there is a problem, check the insulation against earth and the continuity between the connections:
UPC connector PPA track 3 Left headlight track 4
UPC connector PPA track 4 Right headlight track 4
Repair if necessary.
If the fault is still present, contact the Techline.
MR-372-J84-87G000$792_eng.mif

87G - 37
ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Interpretation of commands
87G
V6 MR-372-J84-87G000$792_eng.mif
UPC
Vdiag No.: 44
With xenon lights AC001
(continued)
Check the status and the connection of connector PPA and the fuses on the UPC.
Repair if necessary.
Check the condition and connection of the headlight connectors.
Repair if necessary.
Check the presence of earth on connection R9 then on tracks 4 and 10 of the headlights.
Repair if necessary.
Check the presence of +12 V on track 5 (for Mégane vehicles) or on track 4 (for Scénic type vehicles) for the
headlights when controlled by command AC001.
If everything is fine, run the fault finding procedure (see 80C, Discharge bulbs).
If there is a problem, check the insulation against earth and the continuity of the connections:
UPC connector PPA track 3 Track 5 or track 4 (depending on vehicle type) for the left-hand
headlight
UPC connector PPA track 4 Track 5 or track 4 (depending on vehicle type) right-hand
headlight
Repair if necessary.
If the fault is still present, contact the Techline.
AFTER REPAIRDeal with any other possible faults.
Switch off the ignition and carry out a road test followed by a test with the diagnostic
tool.

87G - 38
ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Interpretation of commands
87G
V6 MR-372-J84-87G000$792_eng.mif
UPC
Vdiag No.: 44
Without xenon lights AC002
DIPPED BEAM HEADLIGHTS
NOTESCheck:
–the status and the connection of fuses 8C and 8D on the UPC,
–the status of the bulbs.
Replace them, if necessary.
Check the status and connection of connector PPA and the fuses on the UPC.
Repair if necessary.
Check the condition and connection of the headlight connectors.
Repair if necessary.
Check the presence of earth on connection R9 then on track 1 of the headlight connector.
Repair if necessary.
Check the presence of +12 V on track 2 of the headlights when controlled by command AC002.
If everything is find, replace the bulb or bulbs.
If there is a fault, check the insulation against earth and the continuity of the connections:
UPC connector PPA track 6 Left headlight track 2
UPC connector PPA track 5 Right headlight track 2
Repair if necessary.
If the fault is still present, contact the Techline.

87G - 39
ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Interpretation of commands
87G
V6 MR-372-J84-87G000$792_eng.mif
UPC
Vdiag No.: 44
With xenon lights AC002
(continued)
Check the status and the connection for connector PPA and the fuses on the UPC.
Repair if necessary.
Check the condition and connection of the headlight connectors.
Repair if necessary.
Check for the presence of earth on connection R9 then on tracks 4 and 10 of the headlight connectors.
Repair if necessary.
Check that there is a +12 V supply on track 3 of the headlights when controlled by command AC002.
If everything is fine, apply the fault finding procedure (see 80C, Discharge bulbs).
If there is a fault, check the insulation against earth is in place and continuity on the connections:
UPC connector PPA track 6 Left headlight track 3
UPC connector PPA track 5 Right headlight track 3
Repair if necessary.
If the fault is still present, contact the Techline.
AFTER REPAIRDeal with any other possible faults.
Switch off the ignition and carry out a road test followed by a test with the diagnostic
tool.

87G - 40
ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Interpretation of commands
87G
V6 MR-372-J84-87G000$792_eng.mif
UPC
Vdiag No.: 44
Without xenon lights AC003
SIDE LIGHTS
NOTESCheck:
–the status and connection of fuses 7A and 7B on the UPC,
–the status of the bulbs.
Replace them, if necessary.
Check the condition and connection of connectors PPA and PPH2 and the fuses in the Protection and
Switching Unit.
Repair if necessary.
Check the condition and connection of the headlights and rear lights.
Repair if necessary.
Check for the presence of earth on connection R9 then on track 1 of the headlights and on track 2 of the rear
lights and the vehicle number plate lights.
Repair if necessary.
Check that there is a +12 V supply on track 5 of the headlights and track 1 of the rear lights and the number
plate when controlled by command AC003.
If everything is fine, replace the bulb or bulbs.
If there is a fault, check the insulation against earth and continuity of the connections:
UPC connector PPH2 track 6 Left rear light track 1
UPC connector PPH2 track 7 Track 1 right-hand rear light and number plate lights
UPC connector PPA track 1 Left headlight track 5
UPC connector PPA track 2 Right headlight track 5
Repair if necessary.
If the fault is still present, contact the Techline.

87G - 41
ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Interpretation of commands
87G
V6 MR-372-J84-87G000$792_eng.mif
UPC
Vdiag No.: 44
With xenon lights AC003
(continued)
Check the status and connection of connectors PPA and PPH2 and the fuses on the UPC.
Repair if necessary.
Check the condition and connection of the headlights and rear lights.
Repair if necessary.
Check for the presence of earth on connection R9 then on tracks 4 and 10 of the headlights and on track 2
of the rear lights and the number plate lights.
Repair if necessary.
Check for the presence of +12 V supply on track 9 of the headlights and track 1 of the rear lights and the
number plate lights when controlled by command AC003.
If everything is fine, replace the bulb or bulbs.
If there is a problem, check the insulation against earth and continuity of the connections:
UPC connector PPH2 track 6 Left rear light track 1
UPC connector PPH2 track 7 Track 1 right-hand rear light and number plate lights
UPC connector PPA track 1 Left headlight track 9
UPC connector PPA track 2 Right headlight track 9
Repair if necessary.
If the fault is still present, contact the Techline.
AFTER REPAIRDeal with any other possible faults.
Switch off the ignition and carry out a road test followed by a test with the diagnostic
tool.