Ultra-wide band sensor software update (SA663)

Bulletin number

TSB_ELE440 (SA663)

Component

Electrical system

Summary

TECHNICAL SERVICE BULLETIN: SERVICE ACTION: ULTRA-WIDE BAND SENSOR SOFTWARE UPDATE (SA663) - This bulletin provides information to improve the Digital Key 2 system logic on certain Digital Key 2-equipped 2025-2027MY Carnival (KA4) and 2025-2027MY Carnival Hybrid (KA4 HEV) vehicles listed in the table below. Under certain conditions, repeated Digital Key recognition may contribute to 12V auxiliary battery discharge. The improved software limits Digital Key recognition after repeated Welcome/Approach Unlock activations, when the user (or digital key) moves away from the welcome zone, or when the battery state of charge falls below a specified threshold. This condition may only affect customers using an Ultra-Wideband-capable smartphone.

Owners of these vehicles have filed 131 complaints in the electrical category.