Mazda 6 Service Manual: No.20 noise occurs at idle when vehicle is stopped in all positions/ranges

No.19 excessive shift shock on torque converter clutch (tcc)

No.21 noise occurs at idle when vehicle is stopped in d, s, l ranges, or in r position

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Mazda 6 Service Manual: Transmitter
NOTE (With theft-deterrent system) The hazard warning lights flash when the theft-deterrent system is armed or turned off. Refer to Theft-Deterrent System. (With the advanced keyless function) A beep sound can be heard for confirmation when the doors are locked/ unlocked using the k ...

Mazda 6 Service Manual: Front door speaker inspection
1. Inspect for resistance between the front door speaker terminals using an ohmmeter. If not as specified, replace the front door speaker. 2. To verify that the front door speaker outputs sound, apply voltage to the front door speaker and release using a 1.5-V battery. If not outp ...