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TSM/TSSM Rapid Flashing Signals


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( This applies especially to bikes that pull trailers )
Harley-Davidson wants to assure that dealers are using the
proper setup procedure for turn signal modules (TSMs) and
turn signal security modules (TSSMs). This procedure is
required because motorcycles equipped with a self-calibrating
TSM/TSSM are designed to work with a variety of turn
signal light bulbs with different current loads (domestic and
HDI bulbs have different current requirements). The procedure
outlined below allows the TSM/TSSM to measure the
turn signal current draw when all turn signal light bulbs are
operating properly. This procedure must be re-initiated after
each time the vehicle’s battery power is removed or interrupted
so that the TSM/TSSM continues to operate properly.
When a turn signal light bulb burns out, the TSM/TSSM
detects the difference in current draw and flashes the turn
signal/indicator lamp at a rate double that of normal operation,
informing the operator that a turn signal light bulb is not
Motorcycles Involved

All 2001-2002 models except Sportster.

2000 models that have been equipped with accessory
Harley-Davidson security systems listed in Table 1.
Required Dealer Action
If battery power to the motorcycle is removed or interrupted
for any reason, the following procedure must be performed to
ensure the turn signal module continues to operate properly.
This must be done before delivery of a new or repaired vehicle.
1. Reconnect battery per service manual procedures.
2. Turn the ignition switch to the IGN position.
During the next two steps, observe the turn signals to ensure
that all bulbs are operating. If you detect a burned out turn
signal bulb, turn off the ignition switch, replace the bulb and
disconnect the battery. Then repeat this procedure beginning
with Step 1.
3. Actuate the left turn signal. Allow the turn signal bulbs to
flash at least five times.
4. Actuate the right turn signal. Allow the turn signal bulbs
to flash at least five times.
5. Turn off the ignition switch.