Body

Sunroof Motor Inspection

~2min read

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

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. Trunk side upper trim (5HB).

k. C-pillar trim.

l. Map light.

m. Sunvisor.

n. Assist handle.

o. Headliner.

6. Measure the voltage at each terminal.

  • If not as specified, inspect the parts listed under “Inspection item” and the related wiring harnesses.

    • If the parts and wiring harnesses are normal but the system still does not work properly, replace the sunroof motor.

Terminal Voltage Table (Reference)


Terminal

Signal

Connected to

Test condition

Voltage (V)

Inspection item

A

Slide open

Sunroof switch

Sunroof is fully opening.

B+

Sunroof switch

Other

1.0 or less

B

Slide close/tilt down

Sunroof switch

Sunroof is closing/tilting down.

B+

Sunroof switch

Other

1.0 or less

C

Tilt up

Sunroof switch

Sunroof is tilting up.

B+

Sunroof switch

Other

1.0 or less

D

—

—

—

—

—

E

IG2

HEATER 10 A fuse

Switch the ignition ON.

B+

HEATER 10 A fuse

Other

1.0 or less

F

—

—

—

—

—

G

GND

GND

Under any condition

1.0 or less

GND

H

—

—

—

—

—

I

—

—

—

—

—

J

Power supply

SUNROOF 15 A fuse

Under any condition

B+

SUNROOF 15 A fuse

Test yourself

A quick Mazda 3 quiz: every answer comes with an explanation and a link to the manual page.