Mazda 3 Service Manual: Antenna Amplifier Inspection

1. Disconnect the negative battery cable..

2. Remove the rain sensor cover. (Vehicles with auto light/wiper system).

3. Disconnect the rain sensor connector. (Vehicles with auto light/wiper system)

4. Partially peel back the seaming welts.

5. Remove the following parts:

a. Sunroof seaming welt (vehicles with sunroof)

b. A-pillar trim.

c. Front scuff plate.

d. Rear scuff plate.

e. B-pillar lower trim.

f. Upper anchor of the front seat belt.

g. B-pillar upper trim.

h. Rear seat cushion.

i. Tire house trim.

j. C-pillar trim.

k. Map light.

l. Sunvisor.

m. Assist handle.

n. Headliner.

6. Connect the negative battery cable..

7. Switch the ignition to ON.

8. Verify that voltage is B+ at the antenna amplifier terminal A.

With audio unit (without display)

With audio unit (with display)

• If the battery voltage can be verified, replace the antenna amplifier.

9. Verify that the continuity between antenna amplifier terminals is as indicated in the table. (with SIRIUS satellite radio system)

• If not as indicated in the table, replace antenna amplifier.