Mazda 6 2002 Workshop Manual page 1019

Diagnostic procedure
INSPECTION
INSPECT BASE UNIT
• Clear DTC.
• Turn on radio and operate it for 3 seconds or more.
• Start on-board diagnostic test mode.
• Is DTC 09:Er22 displayed?
End Of Sie
DTC 09:ER20
DTC 09:Er20 Power supply circuit of base unit
DETECTION • Voltage detected at base unit terminals 1B and 1R is less than 8.5 V, or more than 16 V (must not be
CONDITION 16V).
POSSIBLE • Weak battery
CAUSE • Malfunction in wiring harness between battery and base unit
Diagnostic procedure
STEP
1 INSPECT FUSE
• Remove MIRROR 5 A fuse and ROOM 15 A
fuse.
• Inspect MIRROR 5 A fuse and ROOM 15 A
fuse.
• Are fuses okay?
2 INSPECT BATTERY
• Measure battery voltage.
• Is voltage 8.5 V —16 V?
3 INSPECT WIRING HARNESS BETWEEN
BATTERY AND FUSE BLOCK
• Turn ignition switch to ACC position.
• Measure voltage at fuse block connector
(JB-01) terminals B and fuse block connector
(JB-02) terminals D.
• voltage 8.5 V —16 V?
4 INSPECT WIRING HARNESS BETWEEN
FUSE BLOCK AND BASE UNIT
• Install MIRROR 5 A fuse and ROOM 15 A
fuse.
• Measure voltage at base unit connector
terminals 1B and 1R.
• Is voltage 8.5 V —16 V?
5 INSPECT BASE UNIT
• Clear DTC.
• Turn ignition switch to ACC or ON position
and hold for 30 seconds or more.
• Start on-board diagnostic test mode.
• Is DTC 09:Er20 displayed?
ON-BOARD DIAGNOSTIC [AUDIO]
INSPECTION
Yes Replace base unit.
No Troubleshooting completed.
Yes Go to net step.
No Replace fuse.
Yes Go to net step.
No Battery is weak.
• Inspect charge/discharge system.
Yes Go to net step.
No Repair wiring harness between battery and fuse block.
Yes Go to net step.
No Repair wiring harness between fuse block and base unit.
Yes Replace base unit.
No Troubleshooting completed.
ACTION
A6E817566900W06
ACTION
T–167
T