87B-3V1 MR-376-X76-87B000$020.mif
87B
UCH
VDiag No.: 0F
GENERAL OPERATION
The UCH is involved in the following four functions (shared between several computers):
– Access - Security Function
This function is divided into three sub-functions which are: Access, Protection and Starting (see 82D, Access –
Security).
– Heating and manual air conditioning function.
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.
– 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).
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding – Role of components
87B-14V1 MR-376-X76-87B000$080.mif
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding – Conformity check87B
UCH
VDiag No.: 0F
FUNCTION: ACCESS - SAFETY
SUB-FUNCTION: STARTING
NOTESOnly check conformity after a full check with the diagnostic tool.
The values shown in this conformity check are given as a guide.
Application condition: engine off, ignition on.
FunctionParameter or status
Checked or actionDisplay
and notesFault finding
Supply ET004:+ 12V after
ignition feedYESIn the event of a fault,
apply the interpretation of
status ET004.
Opening
elementsET183:Key already
programmed for
the vehicleYESIn the event of a fault,
apply the interpretation of
status ET183 (see 82D,
Access – Security).
ET184:Valid key codeYES when the ignition is
switched onIn the event of a fault,
apply the interpretation of
status ET184 (see 82D,
Access – Security).
Engine
immobiliserET549:Immobiliser
activeNOIn the event of a fault,
apply the interpretation of
status ET549.
Immobiliser
warning lightET127:Immobiliser
warning lightOFFIn the event of a fault,
apply the interpretation of
status ET127.
KeyPR056:Number of keys
allocated1 to 4In the event of a fault,
apply the interpretation of
status PR056 (see 82D,
Access – Security).
ET185:Key code
receivedYES when the ignition is
switched onIn the event of a fault,
apply the interpretation of
status ET185 (see 82D,
Access – Security).
