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

• 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.

POSSIBLE CAUSE DESCRIPTION (ALL ON-BOARD DIAGNOSTIC FUNCTIONS INOPERATIVE)

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

Fig 1: Identifying BCM Connectors Terminals

Courtesy of MAZDA MOTORS CORP.