GF82.95-P-4200-02A

E-CALL control module, purpose

All data important for an EMERGENCY CALL is a centrally processed in the E-CALL control module (A35/8).It calculates the vehicle position with the aid of the installed GPS control module and generates the emergency call telegram in the event of an emergency call.An installed rollover sensor recognizes a vehicle rollover. With code 348a the CTEL transmitter/receiver (A35) is directly connected to the E-CALL control module (A35/8). With code 349 the CTEL transmitter/receiver (A35) is integrated into the E-CALL control module (A35/8) . The emergency tensioning retractor control module with airbag (AB) (N2/2) data is received via a serial interface. On models 203, 215, 220 the emergency tensioning retractor control module with airbag (AB) (N2/2) is replaced with the restraint system control module (N2/7). The E-CALL control module (A35/8) receives the following messages from the emergency tensioning retractor control module with airbag (AB) (N2/2) : B1: Readiness B2: Test signal for checking function

B3: Front end collision, emergency tensioning retractor control module activated B4: Rear end collision, emergency tensioning retractor control module activated B5: Front end collision, airbag triggered B6: Side collision, side airbag triggered After the EMERGENCY CALL is switched on the E-CALL control module (A35/8) waits for a readiness message from the emergency tensioning retractor control module with airbag (AB) (N2/2) . If this messages is not received after 30 s, the status indicator in the EMERGENCY CALL system pushbutton switch (S93/3) comes on and the error is entered into the DTC memory. However, later incoming readiness messages are accepted and the status indicator goes out again. After the readiness message is received the E-CALL control module (A35/8) awaits an additional readiness confirmation every 500 ms. If this message is not received for longer than 3 s, the status indicator in the EMERGENCY CALL system pushbutton switch (S93/3) comes on and the error is stored in the DTC memory of the E-CALL control module (A35/8) . Later incoming messages are still received

An EMERGENCY CALL is automatically triggered when two crash messages are received in sequence by the E-CALL control module (A35/8) . If a crash message is received once no EMERGENCY CALL is actuated. The E-CALL control module (A35/8) is capable of diagnosis. With "circuit 15R: ON" the E-CALL control module (A35/8) should not be rotated in the longitudinal or lateral plane.

The installed rollover sensor would then recognize a rollover and trigger an EMERGENCY CALL.For this purpose, always position the E-CALL control module (A35/8) in installation position and secure against falling down in removed state and with leads connected.