USB Multi-Box Guidelines (PS634 REV 1)

Publication date: 2020-09-14
Reference number: PS634 REV 1
Supersedes refnos: PS634

USB MULTI-BOX GUIDELINES

TECHNICAL SERVICE BULLETIN

Reference Number(s): PS634 Rev 1, Date of Issue: September 14, 2020

KIA:	All Applicable Models
GROUP:	Electrical

SERVICE INFORMATION

NOTE: This bulletin has been revised to include additional information. New/revised sections of this bulletin are indicated below.

This Pitstop provides information on how to check a USB multi-box for possible connection issues and guidance on resolving Android Auto and Apple CarPlay connection concerns. It also explains the difference between USB port 2.0 and USB port 3.0.

NOTE: USB 3.0 Cables are not compatible with Kia Vehicles.

CHECKING CONNECTIONS FROM USB AND HEAD UNIT

Before considering replacement of the head unit, check the USB cable/harness for a loose connection on the back of the head unit and multi-box. Due to a soft set connection, disconnecting and reconnecting the cable can sometimes restore multi-box functionality.

Back of Head Unit - USB Harness Connection

Back of Multi-box - USB Harness Connection

CASES OF DAMAGE TO MULTI-BOX

If there is physical damage to the multi-box, as seen below, replace the multi-box.

Damage to the USB port can cause misconnection

Damage at the back of the multi-box can cause improper multi-box functionality.

MULTI-BOX GUIDELINE FOR ANDROID AUTO AND APPLE CARPLAY

Android Auto and Apple CarPlay rely on the connection between the customer's phone and head unit. Use the guideline below to prevent Android Auto/Apple CarPlay "No Trouble Found" (NTF) claims, which are subject to chargeback:

Have a known good OEM phone cord (Android or Apple) to test connection between multi-box and phone.
If possible, examine the customer's phone cord (micro-USB, lighting, C-type USB, etc.) for wear and tear. If the connection at the phone's USB port appears loose, recommend replacing the USB cable.
Excess lint, corrosion or debris in the phone's USB port can also interfere with the connection. Make sure there is not a soft set connection from the cable harness that connects from the back of the multi-box and head unit as shown above.
If the issue duplicates, inspect the vehicle's USB port for damage and replace if visible.
If the customer's phone and USB cable connect properly in a known good vehicle, replace the multi-box (not the head unit).

USB 2.0 VS USB 3.0

USB 2.0 Cable	Description
	VCC(pwr) D- (data -) D+ (data +) GND
Multi-box USB 2.0 PIN Layout	Description
	VCC(pwr) D- (data -) D+ (data +) GND
USB 3.0 Cable	Description
	VCC(pwr) D- (data -) D+ (data +) GND SSRX- SSRX+ GND Drain SSTX- SSTX+

Verify if the customer is using a USB 2.0 or 3.0 cable as shown above.

NOTE: USB 3.0 cables are not compatible with Kia vehicles. In this instance, when connected, the phone will charge, but Android Auto/Apple CarPlay may not connect. USB 3.0 Cables are not backwards compatible .