System Functions
IRCL system functions:^ Receives and evaluates IR transmitter signal and door lock switch signal.
^ Activates: (assuming correct IR code)
Central Locking system (PSE/CL)(locks/unlocks vehicle)
Anti-Theft Alarm (ATA) (arms/disarms alarm)
Convenience Feature (CF)(closes windows/sunroof remotely)
^ Actuates feedback lamps (red/green near sensor, hazard flashers with DAS-2a)
Unlocking the vehicle:
DAS-2a: Upon receiving either a valid IR code or a ground signal from the driver's door or trunk lock switch (on pin 1.8), the DAS-2a module initiates an unlocking operation, if the system was in the locked condition. Refer to "SN1/SN2 signals' for details of the unlocking signal.
DAS X: Upon receiving a ground signal from either the front door lock (refer to "Lock arrangement"), the trunk lock, or the IRCL control module (on pin 1.8), the DAS X module initiates an unlocking operation if it was in the locked condition. Refer to "SN1/SN2 signals" for details of the unlocking signal.
In both systems, the green feedback lamp is activated (3 seconds, 3 blinks per second). With DAS-2a, the flashers are also activated (one blink), but only if the system was actuated by an IR signal. No feedback is given if the mechanical key is used.
If the IR transmitter button is pressed twice within 0.8 seconds (previously 0.5 seconds), the DAS system activates the Remote Trunk Release (RTR). The PSE module receives the signal via the unlock signal wire: 140 - A37 pin 1.2 (SN1); 202 - A37 pin C.1 (SN1); 210 - via N10-1 pin A.57 (SN1-2), to PSE over the interior CAN Bus. Model 129 does not have the RTR feature.
If the IR transmitter button is held down, or a mechanical switch is held in the unlock position, the windows and/or sunroof are opened (emergency reversal operation) ONLY IF a comfort closing operation has taken place within the last 15 seconds. That means, if the user was just closing the windows and/or sunroof with the convenience feature (CF) (see explanation following), and initiates an unlocking operation within 15 seconds, the windows and/or sunroof will open again, as an emergency reversing feature. Note that previous versions of IRCL operated in the same way.
If no comfort feature closing operation has taken place in the past 15 seconds, the windows and/or sunroof will not open. If the sunroof was not open, or is already fully closed, no emergency reversal will occur for the sunroof.
If the vehicle is in the locked condition and a valid transponder signal is received when the ignition switch (circuit 15) is turned on, the vehicle is unlocked and the green feedback lamp flashes. However, if the vehicle was locked with the interior CL switch, it does not unlock when the ignition is switched on.
Locking the vehicle:
DAS-2a: Upon receiving a valid IR code, or a ground signal from either the driver's door lock or trunk lock (on pin 1.10), the IRCL ECM initiates a locking operation if it was in the unlocked condition.
DAS X: Upon receiving a ground signal from either the front door lock (Refer to "Lock arrangement"), the trunk lock, or the IRCL control module (on pin 1.10), the DAS X module initiates a locking operation if it was in the unlocked condition. Refer to SN1/SN2 signals' for details of the locking signal.
The red feedback lamp is activated (3 seconds, 3 blinks per second). With DAS-2a, the flashers are also activated (three blinks), but only if the system was actuated by an IR signal. No feedback is given if the mechanical key is used.
If the IR transmitter button is held down, or a mechanical switch is held in the lock position, the windows and/or sunroof are closed (if open). As long as the transmitter button is held down, the red lamp will flash (up to 30 seconds). The red lamp does not light if the mechanical key is used. This feature will not work from the interior mirror IR receiver.
Note that this process can be reversed in an emergency by either releasing and pressing again the IR transmitter button, or holding the key in the unlock position. However, this emergency reversal feature is only possible within 15 seconds of ending the closing function. Refer to "Unlocking the vehicle", above.
Convenience Feature (CF):
The CF system allows the driver to close all open windows and sunroof while locking the vehicle. When locking the vehicle, either with the IR transmitter or the mechanical key, holding the transmitter button or key in the locking position for more than approx. 2 seconds causes the windows and sunroof to be activated in the closing direction. The windows and sunroof continue to close as long as the transmitter button or key is held in the locking position, and stops immediately if either is released. For safety reasons, the closing operation is reversible within 15 seconds of a closing operation as described in unlocking the vehicle' above.
Note:
In Models 202/210, CF will not function via the interior mirror IR receiver - only from the two outside sensors.
DAS system functions:
^ Activates coil surrounding ignition switch (L11, Figure 1)
^ Sends code to transponder chip (in key) and reads response
^ Allows engine to start (if transponder sends correct response)
An important difference between DAS-2 (Model year 1996) and DAS-2a/DAS X is that the security of the DAS system is realized as soon as the key is removed from the ignition lock. Previously, if the vehicle was unlocked, DAS allowed the vehicle to start. This required the customer to lock the vehicle to realize the DAS security features.
With the DAS-2a/DAS X (transponder) system, no action by the customer (other than removing the ignition key) is required. Regardless of the locked/unlocked status of the vehicle, or of the IR transmitter batteries, only a key with the correct transponder chip will allow the engine to start. In many states, an insurance discount is offered for such passive anti-theft features.
Miscellaneous functions:
^ DTC memory
^ Diagnosis via CAN-Bus
Battery Low Indication:
If the IR transmitter detects that its battery is nearly discharged, it slightly modifies the IR code it sends to the IRCL ECM. If IRCL receives this low battery' signal more than one time from a specific IR transmitter, it flashes both the red and green lamps at the same time, to indicate the low battery condition.
Synchronization
As with previous systems, each IRCL transmitter must be enabled and synchronized to operate the system. Transmitters are enabled via the HHT.
To synchronize a transmitter, point it towards the IR receiver and actuate it (by pressing the transmitter button twice). Within 30 seconds, activate circuit 15 (switch ignition on) or actuate either the door or trunk lid CL switch.
Note:
If you synchronize a transmitter by switching on circuit 15, the vehicle is unlocked if it was in the locked condition.
Transmitter Blocking / Desynchronization
As with previous systems, any IR transmitter can be either temporarily disabled or permanently blocked from operating the system. If temporarily disabled, the transmitter can be re-enabled via the HHT. If permanently blocked, the transmitter can in no case be activated again. Permanent blocking should only be performed with written approval of the customer.
Version Coding
When replacing the IRCL control module, the new module must be version coded. After a fixed number of circuit 15 activations (255), version coding for VIN, transponder enablement, and door lock switch (SN circuit) enablement is no longer possible. The version coding remains in memory even if the IRCL module is disconnected from power. When faced with unusual operation of IRCL and related systems, especially PSE/CL, verify that all version coding options are correct. Refer to HHT Information" for details of version coding options.
SN1/SN2 Signals:
The charts describe the signals that are sent out from the control module to operate other Systems such as CL. These signals are best viewed with an oscilloscope, as they are too brief for a voltmeter to register. A "low" signal is approximately 0 volts, a "high" signal is approx. 12 volts.