2009 RENAULT TWINGO RS alternator

87B-7
MR-413-X44-87B000$096.mif
V5
87B
ENGINE HARNESS
FRONT ENGINE WIRING & ADDITIONAL HEADLIGHTS
DOOR WIRING
CEILING WIRING
PASSENGER COMPARTMENT WIRING
REAR BUMPER WIRING
TAILGATE WIRING
1UCH
2Passenger Compartment Relay/Fuse Box
3Electric power-assisted steering.
4Transponder ring.
5Air conditioning panel.
6One touch window/anti-pinch module.
7Exterior temperature sensor.
8Rain/light sensor & interior temperature sensor.
9Anti-pinch/sunroof.
2ABS computer.
2Injection computer.
3Preheating unit.
4Sequential gearbox computer.
5Engine fuse and relay box.
6Alternator.
7
2
61
2
3
5
4
8
5
7
43
1
6
9
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding
- List and location of components
MR-413-X44-87B000$096.mif
UCH
Vdiag No.: 44

87B-8
MR-413-X44-87B000$144.mif
V5
87B
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Operating diagram
1UCH.
2Air conditioning.
3Interior lighting.
4Exterior lighting, signals.
5One touch windows and electric sunroof.
6Alarm.
7Radiofrequency key.
8Starter.
9Opening elements.
10 Front/rear wipers, washers.
11 Alternator.
12 BSS* connection
*BSS: (see Role of components, Role of connection BSS).
1
8
3
2
11
10
9
7
6
5
4
12
MR-413-X44-87B000$144.mif
UCH
Vdiag No.: 44

87B-9
MR-413-X44-87B000$192.mif
V5
87B
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Role of components
GENERAL OPERATION
The UCH is involved in the following five functions (shared between several computers):
–Access-security function
This function is divided into three sub-functions: Access, Protection and Starting (see 82D, Access - Safety).
–Air heating and manual air conditioning function
This function is divided into four sub-functions, which are: User selection, Heating, Cold loop and Passenger
compartment ventilation (see 61A, Heating and see 62C, Manual air conditioning).
In this function, the UCH manages the heated rear screen operation indicator lights, heating controls and air
conditioning activation requests, by sending requests to the engine management computer:
–In the case of a vehicle fitted with manual air conditioning, by pressing on the air conditioning button.
–In the case of a vehicle fitted with climate control, by request from the user or the climate control computer in
automatic mode.
–Wiping function
This function is divided into two sub-functions, which are: Wiper control and Wiper power (see 85A,
Wiping-washing).
–Lighting Function
This function is divided into two sub-functions, which are: Lighting control and Lighting power (see 80D, Lighting).
–Energy management function
Note: There is no UPC on this vehicle; this function is managed by the UCH.
The system is composed of the UCH which stores the programming for electrical energy management, the starter,
the battery, and the alternator controlled via a BSS connection.
The role of this system is:
●to ensure electrical energy is supplied to the vehicle whilst respecting the dynamic performance
constraints of the engine and transmission assembly,
●to control alternator loading* and load shedding** during engine management authorisation or variation of
the electrical load,
●to ensure the quality of the on board network voltage in terms of the voltage level and variation,
●to optimise the battery charge by applying a voltage to its terminals correlating to its initial charge status
(in sleep mode) and to its internal temperature,
●to inform the engine management about the mechanical power taken from the accessories pulley, the
alternator charge rate and the rotor excitation current value,
●to run fault finding on the charging circuit: “Battery” warning light display.
*loading: This operation consists of transferring control of the vehicle's electrical consumption from the battery
to the alternator.
**load shedding: This operation consists of involving the battery in the vehicle's general electric power balance.
MR-413-X44-87B000$192.mif
UCH
Vdiag No.: 44

87B-10
MR-413-X44-87B000$192.mif
V5
UCH
Vdiag No.: 44PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Role of components87B
–Energy management function
Role of BSS connection:
This bidirectional connection located between the UCH and the alternator circulates the following signals:
–Signals sent by the alternator: rotor current value, alternator charge value and electrical, thermal and
mechanical fault statuses.
–Signals sent by the UCH to the alternator: voltage setpoint, rail setpoint and rail inhibition.
Role of the DF terminal:
The signal circulating in the DF terminal is the alternator charge signal (displayed using PR073 "Alternator
charge signal") which is used to adapt the alternator supply to the demands of the electrical consumers
(such as the passenger compartment heating resistors, heated rear screen, etc.).
Depending on the battery charge status, the operating phase and the battery temperature, the UCH determines what
the voltage across the battery terminals should be.
When the battery charge drops, and PR076 Battery voltage after rest decreases, the UCH can temporarily
increase PR075 Alternator setpoint voltage by 1 V for a period of 15 minutes after switching on + after ignition
feed.
Before and during starting, PR075 Alternator setpoint voltage is fixed at 10.7 V.
A maximum of 30 seconds after the engine has started, the UCH sets PR075 Alternator setpoint voltage to the
optimum value calculated.
The injection computer can also control the alternator regulation voltage. The injection computer sends the
maximum authorised power delivered by the engine, to the UCH via the multiplex network. If this power supplied by
the engine is less than the power consumed by the alternator, the UCH reduces the PR075 Alternator setpoint
voltage.
The battery warning light will flash if a low battery charge is detected (no-load voltage less than 12.2 V: voltage
measured during technical use) for the first 12 miles (20 kms), then the warning light stops flashing. Also, the magic
eye of the battery (the hydrometer) is black.
–Access - Security function (see 82D, Access - Security, Role of components).
–Heating and manual air conditioning function (see 61A, Heating, Role of components and 62C, Manual air
conditioning, Role of components).
–Wiping function (see 85A, Washing wiping, Role of components).
–Lighting function (see 80D, Lighting, Role of components). Note:
At the time of user activation, if the mileage is less than 12 miles (20 kms) the charge status is used to display a
warning: this ensures that vehicles are delivered with correct batteries.

87B-12
MR-413-X44-87B000$192.mif
V5
UCH
Vdiag No.: 44PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Role of components87B
CONTINUED (Functions managed by the different UCH ranges on the New Twingo):
L1
Entry levelL2
Mid-rangeL3
Top of the
range
Lighting
Exterior lighting
Side, dipped beam, headlightsX
Direction indicators and hazard warning lightsXX X
One-touch front fog lightsX
One-touch rear fog lightsX
Lights on warning lightXX X
Hazard warning lights when decelerating hardXX X
Illumination of hazard warning lights when airbag triggeredXX X
Illumination of indicators when locking/unlockingXX
Automatic lighting when driving and stationaryX
Delayed extinction of headlights when stationary X
Daytime running lights onX
Lights switch off when driver's door openedX
Interior lighting
Interior lights supply (no gradual dimming function)X
Interior lights supply (gradual dimming)XX
Wipers
Windscreen wipers managementXX X
Automatic management of front wipers with rain sensorX
Rear wipersXX X
Windscreen and rear screen washersXX X
Energy management
Starter managementXX X
Controlled alternator (BSS connection)XX X

87B-24
MR-413-X44-87B000$336.mif
V5
87B
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Fault summary table
Summary of sensors and actuators on which the UCH can carry out fault finding (with the corresponding
engineering office codes).
Tool fault Associated DTC Diagnostic tool title
DF0019510 UCH
DF0119522 Rain/light sensor circuit
DF01295D1 Right-hand direction indicator circuit
DF01395D0 Left-hand direction indicator circuit
DF0279550 External temperature sensor circuit
DF04095A0 Rear screen wiper park position
DF0419560 Heated rear screen warning light circuit
DF0429558 Air conditioning warning light circuit
DF0549501 Computer
DF0629580 Starter relay control circuit
DF06595F0 Electric window authorisation connection
DF0829570 Door locking button indicator light circuit
DF08795C2 Side lights relay control circuit
DF08895C3 Dipped beam headlights relay control circuit
DF09795 A1 Windscreen wiper park position control
DF09895C4 Main beam headlight relay control circuit
DF10895C5 Front fog lights control circuit
DF10995C6 Rear fog lights control circuit
DF1339574 Deadlocking motor(s) circuit
DF13495D2 Hazard warning lights indicator light circuit
DF1359520 Rain detector
DF1369521 Light sensor
DF13796B1 UCH - Alternator connection
DF13896B2 Alternator
DF1399660 Interior lights
DF14096B3 Voltage regulator
DF21295B0 Alarm circuit
MR-413-X44-87B000$336.mif
UCH
Vdiag No.: 44

87B-63
MR-413-X44-87B000$432.mif
V5
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Interpretation of faults
UCH
Vdiag No.: 44
87B
DF137
PRESENT
OR
STOREDUCH - ALTERNATOR CONNECTION
CO : Open circuit
1.DEF : Dialogue disrupted
CC.0 : Short circuit
NOTESThe fault is declared present after:
Switching on the ignition, starting the engine and waiting 30 seconds.
Check that the engine type is entered correctly using the configuration reading "Check
that LC023 Engine Type is correct". Otherwise perform CF028 Engine type.
Customer complaint:
The battery warning light comes on when the fault appears and goes out 10 seconds
after the fault disappears.
Note:
For petrol vehicles, the fault can be linked to a fault on the anti-interference capacitor
if it is present.
Check the condition and connection of the 2-track connector of the alternator (component code 103) and
connector PE1 of component 645 (tabs bent, oxidised, broken).
Check that the voltage is between 5 V and 10 V on connection 2N between components 103 and 645.
Check the continuity and insulation of the following connections:
●Connection code 2N between components 103 and 645.
●Connection code BPDA between components 103 and 163.
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 problem is still present, contact the Techline.
AFTER REPAIRCarry out another fault finding check on the system.
Clear the stored faults.
Deal with any other faults.
UCH_V44_DF135 / UCH_V44_DF136

87B-64
MR-413-X44-87B000$432.mif
V5
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Interpretation of faults
UCH
Vdiag No.: 44
87B
DF138
PRESENT
OR
STOREDALTERNATOR
1.DEF: Mechanical or electrical fault
2.DEF: Temperature fault
NOTESThe fault is declared present after:
Switching on the ignition, starting the engine and waiting 1 minute in the event of an
electrical or mechanical fault.
In the event of a temperature fault, run the engine until the engine cooling fans are
triggered.
Effect on system:
The fault is hidden for 3 seconds, the alternator voltage setpoint is 14.3 V and the on-
board network voltage is equal to 14.3 V if the alternator can still regulate. Regulation
resumes as soon as the fault disappears.
Effect on system:
The battery warning light comes on when the fault appears and goes out as soon as
the fault disappears.
Check for the presence, condition and fitting of the alternator belt. (See MR 411, Mechanical, 11A, Top and front
of engine, Accessories belt: Removal - Refitting).
Remove the accessories belt (MR411, Mechanical, 11A Top and front of engine, Accessories belt, Removal -
Refitting).
Check that the alternator pulley is not offset against its axis.
Check that the alternator pulley turns freely on its axis.
Check that the continuity and electrical insulation of the rotor coil is correct. Check that there is no sign of the rotor
overheating. (See MR 411, Mechanical 16A, Starting - Charging, Charging circuit: Check).
Perform a charging circuit test (see 80A, Battery).
If the fault is still present, replace the alternator (component code 103) (see MR 411, Mechanical 16A,
Starting - Charging, Alternator: Removal - Refitting).
AFTER REPAIRCarry out another fault finding check on the system.
Clear the stored faults.
Deal with any other faults.
UCH_V44_DF138