The TecUpdater 1156 BA15S CANBUS LED bulb is a high-output halogen replacement designed for single-contact automotive lighting positions. It is available in two common configurations:

• PY21W (Amber) – typically used for turn indicators

• P21W (White) – typically used for reverse lights, rear fog, or single-function brake/utility lamps

The bulb uses 54 pieces of 3030 SMD LED chips arranged in a 3D multi-angle configuration to provide uniform reflector illumination.

What Problem It Solves

Factory halogen 1156 bulbs often provide:

• Limited brightness

• Slow illumination response

• Yellowish or uneven output

• Reduced visibility in bright daylight

In indicator applications, halogen bulbs also generate significant heat during prolonged hazard usage. In reverse lighting applications, output is often insufficient for clear rear visibility in low-light areas.

This 54 SMD 3030 LED upgrade improves:

• Light intensity

• Response speed

• Visibility during day and night

• Reflector fill for better spread

Additionally, modern vehicles with bulb monitoring systems may trigger errors when switching to LED. This bulb is designed with high CANBUS compatibility to reduce the chances of dashboard warnings in most vehicles.

In rare cases, depending on the vehicle’s monitoring system sensitivity, an external resistor may still be required.

Where It Is Used

Depending on base type and colour selection:

PY21W (Amber) – Common Uses

• Front turn indicators

• Rear turn indicators

P21W (White) – Common Uses

• Reverse lights

• Rear fog lights

• Single-function brake lights (in some models)

• Utility rear lighting

Application depends entirely on the vehicle’s original bulb specification.

Common Indian Car Compatibility

The 1156 BA15S base is widely used across many vehicles sold in India. Common examples include models from:

• Volkswagen Polo, Vento, Ameo

• Skoda Rapid, Laura, Octavia (older generations)

• Hyundai i20, Verna (select variants)

• Maruti Suzuki Swift, Dzire, Baleno (select applications)

• Tata Nexon, Tiago (reverse/indicator positions depending on variant)

• Mahindra XUV500 (reverse/indicator positions)

Bulb type should always be verified before purchase, as applications may vary by variant and year.

LED Chip and Brightness Logic

The 3030 LED chip architecture is known for strong lumen output and stable thermal characteristics. With 54 SMD elements distributed around the bulb body, light output is projected in multiple directions, ensuring proper reflector utilisation.

The 3D configuration improves brightness perception compared to low-SMD LED replacements.

Because of the high brightness level, prolonged use in continuous hazard mode may generate heat buildup in enclosed housings. The bulb is intended for normal automotive usage conditions.

CANBUS Compatibility

Modern vehicles monitor bulb resistance. LED bulbs draw lower current than halogen bulbs, which can trigger hyperflashing or bulb-out warnings.

This model is built with high CANBUS compatibility and works error-free in most vehicles. However:

• Some vehicles with aggressive monitoring systems may require load resistors

• Compatibility varies by manufacturer and BCM configuration

No coding is required in most cases.

Installation Notes

• Direct replacement for 1156 BA15S base

• No wiring modification required

• Polarity-sensitive in some vehicles (rotate 180° if not lighting)

• Verify PY21W or P21W before ordering

Key Compatibility

Compatible with vehicles using:

• 1156 BA15S base

• PY21W (amber)

• P21W (white)

Used in indicator, reverse, rear fog and single-function brake positions depending on vehicle design.

Not compatible with dual-contact P21/5W sockets.

Who Should Buy This Product

• Users upgrading halogen 1156 bulbs to LED

• Drivers wanting brighter reverse visibility

• Vehicles requiring high brightness amber indicator upgrade

• Cars with CANBUS systems needing higher compatibility LED

Who Should Not Buy This Product

• Vehicles using dual-filament P21/5W bulbs

• Users expecting universal guaranteed error-free installation without verifying compatibility

• Applications requiring ultra-low brightness or decorative lighting

Benefits

• High brightness output

• Faster illumination response

• Strong reflector fill

• High CANBUS compatibility

• Direct halogen replacement

• Available in amber and white

FAQs

Will this cause hyperflashing?
In most vehicles, no. However, some vehicles with sensitive monitoring systems may require external resistors.

How do I choose between PY21W and P21W?
Amber PY21W is typically used for indicators. White P21W is commonly used for reverse or utility lighting. Verify your existing bulb.

Does this fit P21/5W sockets?
No. This is a single-contact 1156 BA15S bulb