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ELECTRICAL
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31. PASSIVE ENTRY PASSIVE START
(PEPS)
The Passive Entry Passive Start (PEPS) system
is remote keyless entry application and is
available in top end models.
Instead of pressing a transmitter button to unlock
or lock the car door and using the traditional key
to start the vehicle (Active Access Request),
PEPS provides enhanced customer convenience
and security via a customer carried, passively
enabled
Smart
key/Electronic
key/User
Identification Device (UID). (Passive Access
Request)
A valid Smart Key allows access to the vehicle’s
passenger compartment, access to the vehicle’s
cargo compartment, and use of the vehicle’s
Start/Stop switch.
The PEPS system is responsible for
authenticating the vehicle user through Low
Frequency (LF) and Radio Frequency (RF)
communication between the vehicle and the
Smart Key.
Thus Passive Entry Passive Start function is a
convenient way to enter and start the vehicle
while maintaining a high level of safety and
security. When the driver presses a door handle
switch carrying a valid smart key (Key Fob), this
system checks the smart key information and
driver door status and locks/unlocks the doors
(passive function). The vehicle can be started
when the driver enters the vehicle with valid Smart
Key and presses the START/STOP switch
(passive start function) by pressing the clutch.
The Passive Entry Passive Start (PEPS) system
consists mainly of following components:
1. PEPS ECU
2. Smart Key
3. Start Stop Switch
4. Electronic Steering Column Lock (ESCL)
5. Door Handle Switches
6. LF Antennas
PRE-CHECKS
1) After performing all the necessary checks as
per the troubleshooting guide, at wire harness,
switches, relays etc., and if no root cause is
found, then follow the below procedure.
2) Connect the diagnostic tool to OBD connector.
3) Wake up PEPS ECU by driver door open or
through RKE Command or passive function.
4) Perform DTC checks using diagnostic tool.
5) Check the customer reported fault, whether it
is rectified.
6) If the fault is rectified, disconnect the OBD
connector and diagnostic tool.
If step 5 (above) is NOT OK, i.e. fault is not
rectified, follow the replacement procedure given
below. Remove the short linking the IGN relay
with battery supply if made (at step 3 above).