DTC U3004:12 [Advanced Keyless Entry And Push Button Start System]: Notes

WARNING: This page is about a different car, the 2010 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.

DTC U3004:12 (ADVANCED KEYLESS ENTRY AND PUSH BUTTON START SYSTEM) DETECTION CONDITION AND POSSIBLE CAUSE

DESCRIPTION	Short to power supply in ACC relay circuit
DETECTION CONDITION	ACC relay output monitor voltage is 2.5 V or more for 0.5 s when the ignition switch is off.
POSSIBLE CAUSE	Relay block connector or terminals malfunction Keyless control module connector or terminals malfunction Short to power supply in wiring harness between the following terminals: Relay block terminal 2E-Keyless control module terminal 3J Relay block malfunction Keyless control module malfunction
Courtesy of MAZDA MOTORS CORP.