Turn Signals: Description and Operation

GF82.10-P-3008BA Turn Signal Lamp Actuation, Function

MODEL 203 as of 1.7.02 up to Model Year 8







Turn signal lamp actuation, function
1 Interior CAN
A1 Instrument cluster
A1e1 Left turn signal indicator lamp
A1e2 Right turn signal indicator lamp
A1h2 Audible turn signal indicator
E1e5 Turn signal
E2e5 Turn signal
E3e1 Turn signal
E4e1 Turn signal
E6/5 Left outside mirror turn signal lamp
E6/6 Right outside mirror turn signal lamp
N10/1 Front SAM control module with fuse and relay module
N10/2 Rear SAM control module with fuse and relay module
N28/1 Trailer recognition control module
N69/1 Left front door control module
N69/2 Right front door control module
N80 Steering column module
S4 Combination switch
X58 Trailer hitch socket (13-pin)

Function sequence for indicating left turn direction
Basic conditions:
- Circuit 15 ON
- The combination switch (S4) is in position "flash on and off left ON" or "flash on and off right ON" .

1 The steering column module (N80) records the position of the combination switch (S4) and sends over the CAN interior the "left flash on and off" or "right flash on and off" signal to the rear SAM control module with fuse and relay module (N10/2).
The rear SAM control module with fuse and relay module (N10/2) serves as a central control unit for all flashing functions.
2 The rear SAM control module with fuse and relay module (N10/2) actuates the turn signal lamp (E3e1 and E4e1) and at the same time it reports over the CAN interior to the instrument cluster (A1), the left or right front door control module (N69/1 or N69/2) and the control module with front fuse and relay module (N10/1) "left flash on and off" or "right flash on and off".
3 The front turn signal lamps are actuated:
- The left or right front door control module (N69/1 or N69/2) actuates the left outside mirror turn signal lamp (E6/5) and right outside mirror turn signal lamp (E6/6).
- The front SAM control module with fuse and relay module (N10/1) actuates the turn signal lamps (E1e5 and E2e5).
4 The instrument cluster (A1) signals the action visually and acoustically:
- The left turn signal indicator lamp or right turn signal indicator lamp (A1e1 or A1e2) flashes on and off.
- The audible turn signal indicator (A1h2) ticks in time with the flash frequency.

Failure of a turn signal lamp
If a turn signal lamp fails then the flashing frequency of the left or right turn signal indicator lamp (A1e1 or A1e2) in the instrument cluster (A1) doubles. The frequency of the turn signal lamps remains unchanged.

Touch flash function
The operational sequence for the turn signal lamp touch control is the same, in relation to the signal flow, as that for the turn signal indicator. The only difference is in how the flash sequence is actuated.
For one-touch turn signaling the lever on the combination switch (S4) should be moved briefly (less than 500 ms) to the desired flashing position. Without the lever engaging into place this procedure will activate 3 turn signal cycles.
The one-touch turn signaling is interrupted by actuation of the hazard warning function or through moving the combination switch (S4) in the opposite direction.