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

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-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-13
MR-413-X44-87B000$240.mif
V5
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.
MR-413-X44-87B000$240.mif

UCH
Vdiag No.: 44

87B-22
MR-413-X44-87B000$288.mif
V5
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-35
MR-413-X44-87B000$384.mif
V5
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Interpretation of faults
UCH
Vdiag No.: 44
87B
DF041
PRESENT
OR
STOREDHEATED REAR SCREEN INDICATOR LIGHT CIRCUIT
CC.1 : Short circuit to + 12 volts
NOTESApply this fault only to versions without heating or with manual climate control.
Conditions for applying the fault finding procedure to stored faults:
The fault appears after:
The ignition is switched of f and back on again and the rear screen de-icer is
requested.
OR
Running command AC019 Heated rear screen indicator light.
Check that fuses F29 (15 A) and F42 (10 A) are sound and correctly fitted in the passenger compartment fuse
and relay box (component code 1016) and/or heating.
Replace the fuse(s) if necessary.
Check the air conditioning control panel black 9-track connector, (component code 319) (bent, oxidised or
broken tabs).
Check that the earth on connection NAM of the manual air conditioning control panel black 9-track connector is
in perfect condition.
Check for + 12 V on connection LPD (by running command AC019 Heated rear screen indicator light) of the
manual air conditioning control panel black 9-track connector.
Check for + 12 V accessories feed on connection SP2 of the manual air conditioning control panel black 9-track
connector.
Check that the rear screen de-icing indicator comes on when activating command AC019 Heated rear screen
indicator.
Check the PE1 40-track connector of the UCH, component code 645 (tabs bent, oxidised, broken).
AFTER REPAIRCarry out another fault finding check on the system.
Clear the stored faults.
Deal with any other faults.
UCH_V44_DF041

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

87B-75
MR-413-X44-87B000$480.mif
V5
UCH
Vdiag No.: 44PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Conformity check87B
FUNCTION: AIR CONDITIONING
SUB-FUNCTION: HEATING
NOTESOnly carry out this conformity check after a complete check with the diagnostic tool
(fault reading and configuration checks).
Application condition: engine stopped, + after ignition feed present.
FunctionParameter or Status
Checked or ActionDisplay and notes Fault finding
HeatingET015:Passenger
compartment
blowerRUNNING
STOPPEDIn the event of a fault, consult the
interpretation of status ET015.
ET239:Ignition switch
position+ after ignition feed.
STARTING
ACCESSORIES FEEDIn the event of a fault, refer to the
interpretation of status ET239.
PR025:Engine speed0 rpmIn the event of a fault, carry out a fault
finding on the multiplex network
(see 88B).
And (see 17B, Petrol Injection,
Conformity check, Protection) or
(see 13B, Diesel Injection,
Conformity check, Protection).
PR001:Battery voltage9 V < X < 16 VIn the event of a fault, run fault finding
on the charging circuit (see 80A,
Battery).
PR002:External
temperature˚CIn the event of a fault, refer to the
interpretation of parameter PR002.
PR024:Engine coolant
temperature˚CIn the event of a fault (see 17B,
Petrol Injection, Conformity check,
Protection) (see 13B, Diesel
Injection, Conformity check,
Protection).
AC060:Rear screen de-
icerThis command is used to
test the operation of the
rear screen de-icer.In the event of a fault, refer to the
interpretation of command AC060.
AC110:Temperature
displayImportant: this command
lasts approximately
30 seconds.
This command is for testing
the display.In the event of a fault, refer to the
interpretation of command AC110.

87B-87
MR-413-X44-87B000$576.mif
V5
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Interpretation of statuses
UCH
Vdiag No.: 44
87B
ET015
PASSENGER COMPARTMENT FAN
NOTESNo faults should be present or stored.
Apply this status for vehicles fitted with manual air conditioning or heating.
Apply the checks if there is an inconsistency between the value of the status
and the air actually blown.
SPECIFICATIONSRUNNING
STOPPED
Check the configuration of the heating and air conditioning type of the vehicle:
–Check that LC013 "Air conditioning type" is "Heating" or "Manual" or "Automatic" according to the
equipment level. Otherwise carry out CF019 Air conditioning type.
Check the presence and condition of fuses F28 (30 A), F29 (15 A), F42 (10 A) on the passenger compartment
fuse and relay box (component code 1016).
Replace the fuse(s) if necessary.
Check the condition and connection of the connectors for the air conditioning control panel and blower unit
(manual air conditioning) (tabs bent, oxidised, broken).
AFTER REPAIRRepeat the conformity check from the start.
Carry out fault finding on the system.
UCH_V44_ET015

87B-91
MR-413-X44-87B000$576.mif
V5
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Interpretation of statuses
UCH
Vdiag No.: 44
87B
ET028
HEATED REAR SCREEN BUTTON
NOTESNo faults should be present or stored.
Apply this status for vehicles fitted with manual air conditioning or heating.
SPECIFICATIONSPRESSED
RELEASED
Check the operation of the heated rear screen button indicator light using AC019 Heated rear screen indicator
light. Check the operation of the rear de-icer using AC060 Rear screen de-icer.
Check that fuses F29 (15A) and F42 (10 A) are sound and correctly fitted in the passenger compartment fuse and
relay box (component code 260).
Replace the fuse(s) if necessary.
Check the air conditioning control panel black 9-track connector, (component code 319) (bent, oxidised or
broken tabs).
If the connector is faulty and there is a repair method (see Technical Note 6015A, Repairing electrical wiring,
Wiring: Precautions for repair), repair the wiring, otherwise replace the wiring.
Check the continuity of the earth NAM connection between component NAM and the 9-track black connector of
the manual air conditioning control panel (component code 319).
Check for + 12 V on connection LPD of the manual air conditioning control panel black 9-track connector
(component code 319).
Check for + 12 V accessories feed on connection SP2 of the manual air conditioning control panel black 9-track
connector.
Check the PE1 40-track connector of the UCH, component code 645 (tabs bent, oxidised, broken).
AFTER REPAIRRepeat the conformity check from the start.
Carry out fault finding on the system.
UCH_V44_ET028