airbag off RENAULT SCENIC 2008 J84 / 2.G Passenger Comparment Connection Unit Workshop Manual

PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - System operation
87B
87B-26
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - System operation
87B
87B-26V9 MR-372-J84-87B000$086.mif
UCH
Vdiag No.: 44, 48,
4C, 4D, 4F, 50
b/ Locking the steering column:
The steering column is locked with the engine off, after the Renault card is removed from the card reader. This
locking operation requires:
–a valid 0 mph (0 km/h) speed signal,
–a correctly functioning airbag and no impact detected,
–a deactivated + after ignition connection.
When the engine has not been started but the after ignition feed is active (e.g. forced after ignition feed), certain
conditions in which there is a drop in the after ignition feed do not cause the steering column to lock ("steering
column not locked" message).
Steering column lock fails if:
1/ Normal non-locking scenarios:
–the card is present in the card reader,
–more than 20 minutes has elapsed with the card in the reader and the engine off,
–the vehicle speed is not zero,
–power is demanded by the steering column lock too frequently.
With regard to vehicles fitted with UCH computer Vdiag 4F or above:
–the Renault card is removed from the card reader when the vehicle is in forced + after ignition feed,
–3 minutes have elapsed following a starting failure due to an engaged gear,
–the Renault card is removed from the card reader following a starting failure due to an engaged gear,
–a front door is open following a starting failure due to an engaged gear and the card is not in the reader.
To lock the steering column, start and stop the engine again.
2/ Abnormal non-locking scenarios:
–the airbag unit is faulty or locked,
–the airbag unit is disconnected,
–the airbag has been triggered,
–the speed signal is not available.
In the event that a steering column does not lock, the driver is informed via the message Steering column not locked.
1.2.3 Locking the injection computer:
When the + after ignition feed has been established, the UCH and the injection computer compare their codes via
the multiplex network. If the codes are identical, the vehicle immobiliser is deactivated (ET046 Immobiliser).
If there is a failure, the immobiliser remains active.
Reactivating protection: the immobiliser is reactivated when the engine stops.

PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Interpretation of statuses87B
87B - 191
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Interpretation of statuses87B
87B - 191V9 MR-372-J84-87B000$516.mif
UCH
Vdiag No.: 44, 48,
4C, 4D, 4F, 50
ET073
CONTINUED
ET073 Unlocked and + after ignition absent.
The status remains UNLOCKED, with the ignition off, in case of failure of the airbag system or the speed signal. If
everything is OK, see dealing with fault DF029: Steering column lock circuit.
ET073 Semi-activated and + after ignition present.
In the semi-activated status, the lock bolt is pulled out, but the UCH cannot determine its position precisely.
In case of inconsistency, contact the Techline.
ET073 Undetermined.
The status is Undetermined. in the event that neither the steering column lock nor the lock sensor can inform the
UCH regarding its position.
Refer to processing of the DF029 Steering column lock circuit fault.
AFTER REPAIRCarry out another fault finding check on the system.
Clear the stored faults.
Deal with any other faults.

PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Fault Finding Chart
87B
87B -371
PASSENGER COMPARTMENT CONNECTION UNIT
Fault finding - Fault Finding Chart
87B
87B -371V9 MR-372-J84-87B000$989mif
UCH
Vdiag No.: 44, 48,
4C, 4D, 4F, 50
ALP46 Steering lock fails
NOTESCheck for any faults on the steering lock.
Check the battery voltage. It should be between 9 V and 16 V.
Check the validity of parameter PR008 "Vehicle speed".
Check for any faults in the Airbag computer (impact detected) and ABS/ESP
computers.
Reminder: In hands-free mode, the steering column lock is locked as soon as the
ignition is switched off.
With the card in the reader, the steering column lock is locked after the ignition is
switched off as soon as the card is removed from the reader.
The conditions for a drop in + after ignition feed without the steering column locking are:
–the card is present in the card reader,
–over 20 minutes passing with the card in the card reader after the engine has stopped,
–the vehicle speed is not zero,
–power being requested by the steering column lock too frequently.
With regard to vehicles fitted with UCH computer Vdiag 4F or above:
–the Renault card is removed from the card reader when the vehicle is in forced + after ignition feed,
–3 mins have elapsed following a starting failure due to an engaged gear,
–the Renault card is removed from the card reader following a starting failure due to an engaged gear,
–a front door is open following a starting failure due to an engaged gear and the card is not in the reader.
Check that these conditions are not present.
Check the consistency of statuses ET072 Steering column lock and ET073 Steering column lock signal.
In the event of a fault, see the procedure for these statuses in the UCH section.
Check that the steering column lock belongs to the vehicle using status ET248 Steering column lock immobiliser
code.
If the fault is still present, contact the Techline.
AFTER REPAIRCarry out a complete check with the diagnostic tool.
UCH_V44_ALP46 /UCH_V48_ALP46/UCH_V4C_ALP46/
UCH_V4D_ALP46/UCH_V4F_ALP46/UCH_V50_ALP46