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

ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Introduction87G
87G - 6V7 MR-372-J84-87G050$055.mif
UPC
Vdiag No.: 48, 4C
4. FAULT FINDING PROCEDURE (continued)
Wiring check
Fault finding problems
Disconnecting the connectors and/or manipulating the wiring harness may temporarily remove the cause of a fault.
Electrical measurements of voltage, resistance and insulation are generally correct, especially if the fault is not
present when the analysis is made (stored fault).
Visual inspection
Look for damage under the bonnet and in the passenger compartment.
Carefully check the fuses, insulators and wiring harness routing.
Look for signs of oxidation.
Tactile inspection
While manipulating the wiring harness, use the diagnostic tool to note any change in fault status from stored to
present.
Make sure that the connectors are properly locked.
Apply light pressure to the connectors.
Twist the wiring harness.
If there is a change in status, try to locate the source of the fault.
Inspection of each component
Disconnect the connectors and check the appearance of the clips and tabs, as well as the crimping (no crimping on
the insulating section).
Make sure that the clips and tabs are properly locked in the sockets.
Check that no clips or tabs have been dislodged during connection.
Check the clip contact pressure using an appropriate model of tab.
Continuity, insulation and resistance check
Check the continuity of entire lines, then section by section.
Look for a short circuit to earth, to + 12 V or to another wire.
If a fault is detected, repair or replace the wiring harness.

ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - System operation87G
87G-12V7 MR-372-J84-87G050$110.mif
UPC
Vdiag No.: 48, 4C
9 - Injection
The Protection and Switching Unit is involved in injection operation, relating to supplying the computer and its
sensors.
Supply malfunctions may lead to engine management customer complaints (rough idle, etc.).
10 - Fuse fault finding
The Protection and Switching Unit can detect the condition of its fuses and indicate faults using:
DF014 LEFT-HAND SIDE LIGHT CIRCUIT.
DF015 RIGHT-HAND SIDE LIGHT CIRCUIT.
DF016 LEFT-HAND DIPPED HEADLIGHT CIRCUIT.
DF017 RIGHT-HAND DIPPED HEADLIGHT CIRCUIT.
DF018 LEFT-HAND MAIN BEAM HEADLIGHT CIRCUIT.
DF019 RIGHT-HAND MAIN BEAM HEADLIGHT CIRCUIT.
DF020 FRONT FOG LIGHT CIRCUIT.
DF021 REVERSING LIGHT(S) CIRCUIT.
DF022 REAR SCREEN DE-ICER CIRCUIT.
DF023 FRONT WINDSCREEN WIPER CIRCUIT.
DF024 GAS COMPUTER SUPPLY.
DF025 AIRBAG/ELECTRIC POWER-ASSISTED STEERING SUPPLY.
DF026 AUTOMATIC TRANSMISSION SUPPLY.
DF029 STEERING COLUMN LOC/ENGINE MANAGEMENT SUPPLY.
DF030 AIR CONDITIONING COMPRESSOR SUPPLY CIRCUIT.
DF031 HEADLIGHT WASHERS SUPPLY CIRCUIT.
DF032 + 12 V RELAY SUPPLY CIRCUIT.
DF036 STEERING COLUMN LOCK SUPPLY CIRCUIT.
To carry out fault finding on the fuses, run command AC016 Test electrical supply circuits.
If a fuse is faulty, the associated fault becomes STORED.
Once the fuse has been replaced or the repair completed, run command AC016 Test electrical supply circuits
again to clear the fault.
Protection and Switching Unit Version
There are 4 Protection and Switching Unit versions:
–N1: vehicle with a 340 W fan assembly.
–N2: vehicle with a 460 W fan assembly.
–N3: vehicle with a 550 W fan assembly (external relay).
–N4: vehicle with 340 W, 460 W or 550 W fan assemblies + automatic transmission and/or LPG and/or with
headlight washers.

ENGINE COMPARTMENT CONNECTION UNIT
87G
87G - 15V7 MR-372-J84-87G050$275.mif
UPC
Vdiag No.: 48, 4CENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Fault summary table
Summary of faults on which fault finding can be performed by the Protection and Switching Unit.
(With corresponding design office codes).
Tool fault Associated DTC Diagnostic tool title
DF006 920E COMPUTER
DF007 9211 UPC - ALTERNATOR CONNECTION
DF009 9214 + AFTER IGNITION FEED CIRCUIT (Vdiag 4C only)
DF012 9210 ALTERNATOR
DF013 920F VOLTAGE REGULATION
DF014 9217 LEFT-HAND SIDE LIGHT CIRCUIT
DF015 9218 RIGHT-HAND SIDE LIGHT CIRCUIT
DF016 9215 LEFT-HAND DIPPED HEADLIGHT CIRCUIT
DF017 9216 RIGHT-HAND DIPPED HEADLIGHT CIRCUIT
DF018 921B LEFT-HAND MAIN BEAM HEADLIGHT CIRCUIT
DF019 921C RIGHT-HAND MAIN BEAM HEADLIGHT CIRCUIT
DF020 921D FRONT FOG LIGHT CIRCUIT
DF021 9226 REVERSING LIGHT(S) CIRCUIT
DF022 921E REAR SCREEN DE-ICER CIRCUIT
DF023 921A WINDSCREEN WIPER CIRCUIT
DF024 9222 GAS COMPUTER SUPPLY
DF025 9223 ELECTRIC POWER ASSISTED STEERING/AIRBAG
SUPPLY
DF026 9224 AUTOMATIC GEARBOX SUPPLY
DF027 9225 ACCESSORIES SUPPLY
DF029 9221 INJECTION/STEERING COLUMN LOCK SUPPLY
DF030 9219 CLIMATE CONTROL COMPRESSOR SUPPLY CIRCUIT
DF031 921F HEADLIGHT WASHER SUPPLY CIRCUIT
DF032 9227 +12 V RELAY SUPPLY CIRCUIT
DF033 9229 FAN ASSEMBLY SUPPLY CIRCUIT
DF034 9212 ALTERNATOR TYPE
DF035 9213 COMPUTER SUPPLY VOLTAGE
DF036 9220 STEERING COLUMN LOCK SUPPLY CIRCUIT
MR-372-J84-87G050$275.mif

ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Interpretation of faults87G
87G-22V7 MR-372-J84-87G050$330.mif
UPC
Vdiag No.: 4C
DF009
PRESENT
OR
STORED+ APC CIRCUIT
1.DEF: Permanent low level
2.DEF: Permanent high signal
NOTESSpecial note:
This fault only applies to Vdiag 4C.
Conditions for applying the fault finding procedure to present faults:
The fault is declared present after the ignition has been switched on.
Use Wiring Diagrams Technical Note for Mégane II or Scénic II.
Check the connection and condition of the LPG electric control unit connector, component code 997.
Check for a voltage on connection AP31 to the connector for the LPG electric control unit, component code 997.
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.
Check the connection and condition of the multifunction switch, the reverse gear switch and the manual
gearbox neutral sensor/reversing lights, component codes 485, 155, and 1109.
Check for a voltage on connection AP11 to the connectors for the multifunction switch, the reverse gear switch
and the manual gearbox neutral sensor/reverse lights, component codes 485, 155, and 1109.
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.
Check the connection and condition of the passenger compartment electric control unit, component code 645.
Check for a voltage on connection APCB to the connector for the passenger compartment electric control unit,
component code 645.
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.
Check the connection and condition of the electric steering column lock, component code 1088.
Check for a voltage on connection AP15 to the connector for the electric steering column lock, component code
1088.
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.
Check the connection and condition of the airbag/pretensioner electric control unit and the electric power-
assisted steering system, component codes 756 and 1232.
Check for a voltage on connection AP44 to the connectors for the airbag/pretensioner electric control unit and
the electric power-assisted steering system connectors, component codes 756 and 1232.
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.
AFTER REPAIRErase the faults from the computer memory, switch the + after ignition supply off and
back on again and run another check using the diagnostic tool.
USM_V4C_DF009

ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Interpretation of faults87G
87G-23V7 MR-372-J84-87G050$330.mif
UPC
Vdiag No.: 4C
DF009
CONTINUED
Check the connection and condition of the passenger compartment fuse and relay box, the gear lever display,
the steering column top control module, the additional heater relay 1 and 2, the diagnostic socket, the
parking distance control ECU, the right and left-hand rear electric window switch, the radio, the electric
door mirror control, the front and rear electric window locking controls and the passenger electric window
switch, component codes 260, 1129, 1546, 1067, 1068, 225, 1222, 130, 131, 261, 134, 135, 1511, 1512
and 133.
Check for a voltage on connection AP43 to the connectors for the passenger compartment fuse and relay box,
the gear lever display, the steering column top control module, the additional heater relay 1 and 2, the
diagnostic socket, the parking distance control ECU, the right and left-hand rear electric window switch,
the radio, the electric door mirror control, the front and rear electric window locking controls, the
passenger electric window switch, component codes 260, 1129, 1546, 1067, 1068, 225, 1222, 130, 131, 261,
134, 135, 1511, 1512 and 133.
If the connection or connections are faulty and if 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:
–AP31 between components 1337 and 997,
–AP11 between components 1337, 485, 155 and 1109,
–APCB between components 1337 and 645,
–AP15 between components 1337 and 1088,
–AP44 between components 1337, 756 and 1232,
–AP43 between components 1337, 260, 1129, 1546, 1067, 1068, 225, 1222, 130, 131, 261, 134, 135, 1511, 1512
and 133.
If the connections are faulty and if there is a repair procedure (see Technical Note 6015A, Electrical wiring
repair, Wiring: Precautions for repair), repair the wiring, otherwise replace it.
Check the connection and condition of the Protection and Switching Unit, component code 1337.
If the connector is faulty and if there is a repair procedure (see Technical Note 6015A, Electrical wiring repair,
Wiring: Precautions for repair), repair the connector, otherwise replace the connector.
If the fault is still present, contact the Techline.
AFTER REPAIRErase the faults from the computer memory, switch the + after ignition supply off and
back on again and run another check using the diagnostic tool.

ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Interpretation of faults87G
87G - 48V7 MR-372-J84-87G050$385.mif
UPC
Vdiag No.: 48, 4C
DF029
PRESENT
OR
STOREDINJECTION/STEERING COLUMN LOCK SUPPLY
CC.0 : Short circuit to earth
CC.0
NOTESSpecial note:
To display this fault as present or stored, run command
AC016 Electrical supply circuits test.
Use Wiring Diagrams Technical Note for Mégane II or
Scénic II.
Check that the UPC fuse F18 (5A) is correct.
Check the insulation, continuity and the absence of interference resistance on the following connections:
–AP15, between components 1337 and 120,
–AP15, between components 1337 and 1088.
If the connection or 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 REPAIRRun command AC016 Electrical supply circuits test.
Clear the computer fault memory, switch the + after ignition supply off and back on, and
run another check with the diagnostic tool.
USM_V48_DF029/USM_V4C_DF029

ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Interpretation of faults87G
87G - 55V7 MR-372-J84-87G050$385.mif
UPC
Vdiag No.: 48, 4C
DF036
PRESENT
OR
STOREDSTEERING COLUMN LOCK SUPPLY CIRCUIT
CC.0 : Short circuit to earth
CC.0
NOTESSpecial note:
To display this fault as present or stored, run command
AC016 Electrical supply circuits test.
Use Wiring Diagrams Technical Note for Mégane II or
Scénic II.
Check that the UPC fuse F11 (15A) is sound.
Check the insulation, continuity and the absence of interference resistance on the following connection:
–APCB, between components 1337 and 645.
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 the Techline.
AFTER REPAIRRun command AC016 Electrical supply circuits test.
Clear the computer fault memory, switch the + after ignition supply off and back on, and
run another check with the diagnostic tool.
USM_V48_DF036/USM_V4C_DF036

ENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Interpretation of statuses87G
87G-65V7 MR-372-J84-87G050$550.mif
UPC
Vdiag No.: 48, 4CENGINE COMPARTMENT CONNECTION UNIT
Fault finding - Interpretation of statuses
ET002
FRONT WIPER PROTECTION
NOTESSpecial notes:
Only apply the checks if the status is ACTIVE or BLOCKED.
If the status is ACTIVE, this indicates that after a wiping request, the Protection and
Switching Unit has detected abnormal operation for more than 6 seconds
(constrained or blocked).
If the status is BLOCKED, this means that the total duration of intermittent pauses is
greater than 2 minutes.
The status returns to INACTIVE as soon as the UCH requests another wiping setpoint
(wiper control adjusted, or request by the rain sensor).
Use Wiring Diagrams Technical Note for Mégane II or Scénic II.
Make sure that nothing is mechanically blocking the movement of the wiper arms (blades stuck, condition and
assembly of the wiper mechanism linkage and that there are no objects that could impede the movement of the
mechanism).
Check that the wiper mechanism is not seized.
Repair if necessary.
Check the condition and connection of connectors CT1 and CN on the Protection and Switching Unit,
component code 1337.
If the connectors are 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 windscreen wiper motor connector, component code 212.
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:
–14M between components 1337 and 212,
–14L between components 1337 and 212,
–14K between components 1337 and 212.
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 REPAIRRepeat the conformity check from the start.
USM_V48_ET002 /USM_V4C_ET002
MR-372-J84-87G050$550.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