DTC B14B3-87: Lost Communication with Rear Panel LIN Missing Message [08/2023 - ]: Description

WARNING: This page is about a different car, the 2025 Lexus RX 450h+ and 2024 Lexus RX 450h+. However, it is still accessible from the selected car via links, so may be relevant.

The rear seat heater switch communicates with the air conditioning amplifier assembly via LIN communication.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory	DTC Output from	Priority	Note
B14B3-87	Lost Communication with Rear Panel LIN Missing Message	Diagnosis Condition: Ignition switch ON Malfunction: Error or open in communication line between air conditioning amplifier assembly and rear seat heater switch Detection Time: Continuously for 10 seconds or more	Harness or connector Rear seat heater switch Air conditioning amplifier assembly	Does not come on	Memorized	Air Conditioner	A	-

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

DTC Output from

Priority

Note

B14B3-87

Lost Communication with Rear Panel LIN Missing Message

Diagnosis Condition:

Ignition switch ON

Malfunction:

Error or open in communication line between air conditioning amplifier assembly and rear seat heater switch

Detection Time:

Continuously for 10 seconds or more

Harness or connector
Rear seat heater switch
Air conditioning amplifier assembly

Does not come on

Memorized

Air Conditioner

DTC DETECTION CONDITION COMBINATION TABLE

		Vehicle Condition
		Pattern 1	Pattern 2
Diagnosis Condition	Ignition switch ON	◦	◦
Malfunction	Error in communication line between air conditioning amplifier assembly and rear seat heater switch	◦	-
Malfunction	Open in communication line between air conditioning amplifier assembly and rear seat heater switch	-	◦
Detection Time		Continuously for 10 seconds or more	Continuously for 10 seconds or more
Trip Count		1 trip	1 trip

HINT:

If the conditions of either of these patterns are detected, a DTC will be stored.