light RENAULT TWINGO 2009 2.G Engine And Peripherals Passenger Compartment Connection Unit OBD Workshop Manual

87B-5
MR-413-X44-87B000$048.mif
V5
UCH
Vdiag No.: 44PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Introduction87B
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.

87B-7
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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
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Vdiag No.: 44

87B-8
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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
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Vdiag No.: 44

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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.
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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.

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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-13
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87B
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Replacement of components
When replacing the UCH (see MR 411, Mechanical systems, 87B, Passenger compartment connection unit).
If replacing the computer, carry out the programming and configuration operations described (see configurations
and programming).
The order of programming and configuration operations is as follows:
1 - Write the VIN, using command VP004 Write VIN.
2 - Program the UCH using command SC004 UCH programming.
3 - Configuration of the UCH (in the Configuration and programming menu) using the following commands:
CF031 Calibration,
CF019 Type of heating and air conditioning system,
CF028 Engine type,
CF171 Temperature display,
CF029 External temperature sensor,
CF173 One-touch windows/sunroof (SR)*.
CF032 See-me-home lighting,
CF021 Front fog lights,
CF014 Daytime running lights
CF193 Automatic headlight function,
CF194 Automatic wiping function,
CF035 Rain/light sensor,
CF191 Wiper intermittent speed ring,
CF024 Hazard warning lights activated by ABS,
CF108 Locking via the RAID,
CF009 Deadlocking,
CF192 Central door locking,
CF195 Type of key,
CF229 Alarm.
4 - Key allocation, using command SC015 Key allocation.
5 - Configuration of the multiplex network is used to define (in the UCH) the different computers present and which
support fault finding on the multiplex network.
* TO: Sunroof.
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UCH
Vdiag No.: 44

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Vdiag No.: 44PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Configurations and programming87B
Functions available and operating mode
–Deadlocking (CF009)
This function enables you to disable the interior door opening control. This function is activated by a second locking
request from the key or the electric central locking switch.
This function is only available on vehicles fitted with a top of the range UCH.
–Hazard warning lights activated by ABS (CF024)
This function is available for all countries except Brazil, Finland, Great Britain, Japan and Sweden.
For Brazil, Great Britain, Japan, Sweden and Finland configure NONE.
For other countries, configure WITH.
In the event of braking causing rapid deceleration, the ABS computer transmits an activate hazard warning lights
request via the multiplex network to the UCH.
–New vehicle storage mode (LC041 New vehicle storage mode)
If this mode is activated, consult the command, see LC041 "New vehicle storage mode" and contact the Techline.
–Daytime running lights
This configuration automatically activates the side lights and dipped beam headlights when the engine is running,
without the driver using the lighting controls.
To be used in accordance with legislative requirements.
CF031 Calibration:
When replacing the UCH computer, perform this configuration.
This command lasts approximately 30 seconds.

87B-22
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UCH
Vdiag No.: 44PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Configurations and programming87B
UCH CONFIGURATIONS
List of individual configurations available on the diagnostic tool with the associated configuration reading.
* SR: Sunroof.
*RF: radio frequencyConfigurationConfiguration
readingName of configuration Choice of configuration
CF031 "Calibration",To be performed if replacing
the UCH.
CF019 LC013"Type of heating and air conditioning
system",HEATING/MANUAL/
AUTOMATIC
CF028 LC023 "Engine type",Configuration. 1 (K9K)
Configuration. 2 (D7F/D4F
without air conditioning)
Configuration. 3 (other engine)
CF171 LC067 "Temperature display"WITH/WITHOUT
CF029 LC002 "Exterior temperature sensor",WITH/WITHOUT
CF173 LC070 "One-touch windows/SR*",WITH/WITHOUT
CF032 LC025 "See-me-home lighting",WITH/WITHOUT
CF021 LC015 "Front fog lights"WITH/WITHOUT
CF014 LC008 "Daytime running lights",WITH/WITHOUT
CF193 LC095 "Automatic headlighting function",WITH/WITHOUT
CF194 LC096 "Automatic wiping function",WITH/WITHOUT
CF035 LC044 "Rain/light sensor", PRESENT/ABSENT
CF191 LC094 "Wiper intermittent speed ring",WITH/WITHOUT
CF024 LC018"Hazard warning lights switched on by
ABS",WITH/WITHOUT
CF108 LC040 "Automatic locking when driving",WITH/WITHOUT
CF009 LC003 "Deadlocking",WITH/WITHOUT
CF192 LC093 "Central door locking",WITH/WITHOUT
CF195 LC097 "Type of key". STANDARD/RF*
CF229 LC126 "Alarm".WITH/WITHOUT

87B-24
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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