DTC B1131 [Advanced Keyless System]: Notes

WARNING: This page is about a different car, the 2007 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.

DTC B1131 POSSIBLE CAUSE TABLE

DTC B1131	Keyless antenna (exterior, rear)
DETECTION CONDITION	Keyless antenna dose not operated.
POSSIBLE CAUSE	Keyless antenna (exterior, rear) malfunction Open or short circuit in wiring harness between keyless control module and keyless antenna Keyless control module malfunction
Courtesy of MAZDA MOTORS CORP.