Suzuki Motorcycle DR-Z400SM front and rear turn signal bulbs use 12496, PY21W, or P21W size specifications. The replacement chart covers 2005 through 2019 production years with corresponding bulb size data.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Suzuki Motorcycle DR-Z400SM uses three distinct bulb types across its turn signal positions and model years: the 12496, PY21W, and P21W. All three operate at 12 volts, making them consistent in electrical compatibility despite their other differences.
The P21W is an ECE-standard single-filament signalling bulb rated at 21 watts and fitted with a BA15s bayonet base. It appears in both the front and rear turn signal positions on the DR-Z400SM for the 2005-2008 model years.
The PY21W is also an ECE-standard single-filament bulb rated at 21 watts, but it produces amber light by design and uses a BAU15s bayonet base. The offset pin arrangement of the BAU15s base physically prevents it from being seated in a BA15s socket, meaning the PY21W and P21W are not interchangeable despite sharing the same wattage and voltage rating.
The 12496 is a halogen bulb designated for specialty applications and referenced by Philips and Osram part numbering rather than an ECE standard code. It is rated at 12 volts and is used across multiple DR-Z400SM model years in both front and rear positions.
The front and rear turn signal positions on the DR-Z400SM do not consistently use the same bulb type within a given model year. For example, the 2016 front position specifies a PY21W while the 2016 rear position specifies a 12496, requiring separate attention when sourcing replacements.
The 2019 DR-Z400SM specifies the 12496 for both the front and rear turn signal positions, while the 2018 model specifies the PY21W for both positions, indicating that the same positional pairing does not carry over between consecutive years.
Because the PY21W uses a BAU15s base and the P21W uses a BA15s base, substituting one for the other in a housing designed for a specific base type risks improper fitment or failure to make electrical contact.