82D-8V1 MR-376-X76-82D000$030.mif
ACCESS - SECURITY
Fault finding – Operating diagram82D
UCH
Vdiag No.: 0F
Layout of the Access - Safety function
Access (RF*) and protection (engine immobiliser system) of the vehicle:
The access function (locking/unlocking) is provided by the UCH and the key.
Communication between the key and the UCH is made via radio frequency transmission at 433 MHz.
When the switch is pressed, the key sends out a radiofrequency wave signal. The UCH receives the signal via its
built-in aerial.
The UCH authenticates the key and carries out the user's request if the key is allocated to the vehicle.
Access via radiofrequency:
PROTECTION (Immobiliser)
RF*: Radiofrequency
Unité Centrale Habitacle (Passenger
Compartment Central Unit)
Key
– Authentication of the key
– Door locking system
Radio frequency
signals
Key +
transponderTransponder ring
Magnetic field used as communication
medium between the key transponder and the
transponder aerial
82D-41
AFTER REPAIRCarry out a complete check with the diagnostic tool.
V1 MR-376-X76-82D000$170.mif
ACCESS - SECURITY
Fault finding – Fault finding chart82D
UCH
Vdiag No.: 0F
ALP 7
CONTINUED 3
Check the battery voltage when the starter is turning and check the earth straps connecting the engine and
transmission assembly to the vehicle chassis.
Check that the starter motor has not seized or locked.
If the fault is still present, replace the starter motor (see MR 374, Mechanical, 16A, Starting - Charging, Starter:
Removal - Refitting).
C
