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

87G - 7
ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - System operation
87G
V6 MR-372-J84-87G000$132_eng.mif
UPC
Vdiag No.: 44ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - System operation
1. GENERAL FUNCTIONING
The UPC particpates in the following functions:
–distributing and protecting the electrical power,
–keyless vehicles,
–wipers,
–lighting,
–de-icing,
–air conditioning,
–oil pressure detection.
Distributing and protecting electrical power
The main function of the UPC is to switch on and distribute part of the power in order to supply the vehicle systems,
actuators or computers.
Another part of the power supply distribution is housed in the Engine Interconnection Unit but is not controlled
electronically by the computer.
+12 V battery feed
The UPC receives energy from the battery via the 1 track screwed connector and redistributes +12 V around the
vehicle.
+ after ignition feed
The UCH requests the + APC via the multiplex network. When the UPC receives this request, it controls the APC
relay unconditionally.
Energy management
The computer transmits the signal to load the alternator on the multiplex network.
Keyless vehicle
In the Keyless vehicle function, the UPC participates in the start-up sub-function. The computer:
–receives the request to start up the UCH via the multiplex network,
–check that the start-up conditions have been met then controls the starter relay,
–can inhibit or turn off the starter relay command by means of a forbid start-up signal transmitted by the
injection computer on the multiplex network.
Air conditioning
For the operation of this function and the role of the UPC in setting up this function (see 62A, Air conditioning,
Function architecture and General functioning mode).
Cold loop
The computer receives the compressor switch-on request from the injection via the multiplex network.
The computer controls the compressor clutch activation relay.
Heating
The computer also controls the de-icing of the rear tailgate window and the electric rear view mirrors.
Fan assembly
When prompted for the engine check request, the UPC supplies the GMV with power.
MR-372-J84-87G000$132_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 - 12
ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Summary of faults
87G
V6 MR-372-J84-87G000$396_eng.mif
UPC
Vdiag No.: 44ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Summary of faults
Tool fault Associated DTC Diagnostic tool title
DF002 9210 HIGH SPEED FAN RELAY CONTROL CIRCUIT
DF005 920E INTERNAL ELECTRONIC FAULT
DF009 920D + IGNITION CIRCUIT
MR-372-J84-87G000$396_eng.mif

87G - 13
ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Interpretation of faults
87G
V6 MR-372-J84-87G000$462_eng.mif
UPC
Vdiag No.: 44ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Interpretation of faults
DF002
PRESENT
HIGH SPEED FAN RELAY CONTROL CIRCUIT
CC.1 : Short circuit to +12 V
NOTESSpecial notes:
The function is inhibited when the fault is present.
Reactivating the function via a new ignition request.
Measure the resistance between tracks 1 and 2.
If the resistance is not 65 ΩΩ Ω Ω
± 10 ΩΩ Ω Ω
, replace the relay.
Take the relay out and make sure that it is insulated from the +12 V for the connection:
UPC connector PPM2 track 2 Track 2 of the fan relay connector
Repair if necessary.
If the fault is still present, check for the absence of +12 V on track 2 of the UPC connector PPM2.
If +12 V is present, contact the Techline.
AFTER REPAIRClear the computer memory.
Turn the ignition off and then on again, then run a new check using the fault finding tool
MR-372-J84-87G000$462_eng.mif

87G - 26
ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Status and parameter summary table87G
V6 MR-372-J84-87G000$594_eng.mif
UPC
Vdiag No.: 44ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Status and parameter summary table
Tool status Diagnostic tool title
ET001 BATTERY WARNING LIGHT
ET002 WINDSCREEN WIPER PROTECTION
ET004 REVERSE GEAR ENGAGED
ET005 MANUAL GEARBOX GEAR LEVER POSITION
ET010 START CONDITIONS SATISFIED
ET013 HIGH SPEED FAN ASSEMBLY RELAY CONTROL
ET026 + AFTER IGNITION FEED
ET027 OIL PRESSURE CONTACT
Tool parameter Diagnostic tool title
PR010 ALTERNATOR
MR-372-J84-87G000$594_eng.mif

87G - 47
ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Interpretation of commands
87G
V6 MR-372-J84-87G000$792_eng.mif
UPC
Vdiag No.: 44
UPC type N2 AC010
HIGH-SPEED FAN UNIT
NOTESThis command is only applicable on versions fitted with air conditioning.
Check:
–the condition and connection of fuse 11 (UPC level N3 only).
Replace it if necessary.
Check the condition and connection of the fan connector.
Repair if necessary.
Ensure that the fan is properly earthed.
Check the resistance of the external high-speed fan control relay: 65 ΩΩ Ω Ω
± 10 ΩΩ Ω Ω
.
Replace it if necessary.
Check the presence of +12 V on track 1 of the high-speed fan external control relay when controlled by
command AC010.
If there is a fault, check the insulation against earth and continuity of the connection
UPC connector PPM2 track 3 Track 1 of the high-speed fan external control relay
Repair if necessary.
Check that there is earthing on track 2 of the high-speed fan external control relay.
If there is a fault, check the insulation against +12 V and continuity of the connection:
UPC connector PPM2 track 2 Track 2 of the high-speed fan external control relay
Repair if necessary.
Check for the presence of +12 V supply on track 1 of the fan while controlled by command AC010.
If there is a problem, check the insulation against earth and continuity of the connection:
Fan track 1 Track 5 of the high-speed fan external control relay
Repair if necessary.

87G - 48
ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Interpretation of commands
87G
V6 MR-372-J84-87G000$792_eng.mif
UPC
Vdiag No.: 44
AC010
(continued 1)
Check for the presence of a +12 V supply battery on track 3 of the high-speed fan external control relay.
If there is a fault, check the insulation against earth and continuity of the connections:
High-speed fan external relay track 3 Track 1 of the power supply fuse plate
Repair if necessary.
Check fuse F1 on the power supply fuse plate.
Replace it if necessary.
If the fault is still present, contact the Techline.

87G - 51
ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Interpretation of commands
87G
V6 MR-372-J84-87G000$792_eng.mif
UPC
Vdiag No.: 44
Rear-view mirrors (if equipped with heaters) AC011
(continued)
Check the condition and connection of connector PPH1 on the UPC.
Repair if necessary.
Check the condition and connection of the rear-view mirror connectors.
Repair if necessary.
Check for the presence of earth on track 5 of the rear view mirror connectors.
Check for the presence of a +12 V supply on track 1 of the rear view mirror connector while controlled by
command.
If there is a fault, check the insulation against earth and continuity of the connection:
UPC connector PPH1 track 2 Track 1 of the rear view mirror passing via the fuse box and
the passenger compartment relay
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.