No.2 All On-Board Diagnostic Functions Inoperative [Keyless Entry System]: Notes

WARNING: This page is about a different car, the 2007 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.

When performing an asterisked (*) troubleshooting inspection, slightly shake the wiring harness and connectors while performing the inspection to discover whether poor contact points are the cause of any intermittent malfunctions. If there is a problem, verify that the connectors, terminals and wiring harnesses are connected correctly and undamaged.

DETECTION CONDITION POSSIBLE CAUSE

2	All on-board diagnostic functions inoperative
DESCRIPTION	Malfunction in PJB power supply circuit, door latch switch circuit, PJB ground circuit, or keyless control module.
POSSIBLE CAUSE	Malfunction in IG1 or power supply signal circuit of PJB PJB power supply fuse malfunction Malfunction in wiring harness between PJB power supply fuses and PJB Malfunction in door open/closed signal circuit of PJB Door latch switch system malfunction PJB malfunction Malfunction in wiring harness between PJB and door latch switch Malfunction in PJB GND signal circuit Malfunction in wiring harness between PJB and ground Malfunction in keyless control module Keyless control module malfunction Malfunction in wiring harness between keyless control module and PJB
Courtesy of MAZDA MOTORS CORP.