Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Rear Fuse/Relay Box DTCS
/Relay Box DTCS Rear Fuse/Relay Box DTCS REAR FUSE/RELAY BOX DIAGNOSTIC TROUBLE CODE (DTC) INDENTIFICATION DTC Description DTC B1955 Rear MICU Lost Communication with MICU (MICU Message) DTC B1956 Rear MICU Lost Communication with Gauge Control Module (A/T Message) DTC B1957; B1958 Rear MICU Lost Communication with Combination Switch Control Unit (HLSW Message); Rear MICU Lost Communication with Combination Switch Control Unit (WIPSW Message) DTC B1959 Rear MICU Lost Communication with Relay Control Module (RM Message)
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.