DTC B12B7:15 [MAZDA ERA-GLONASS CONTROL MODULE]

id0902r6081300

Description

Mazda ERA-GLONASS switch (green indicator) circuit malfunction
Detection condition
The Mazda ERA-GLONASS control module detected an open circuit or a short to power supply in the Mazda ERA-GLONASS switch (green indicator) circuit for 2 seconds with the ignition switched ON (engine off or on).
Fail-safe function
Not applicable
Possible cause
•  Mazda ERA-GLONASS switch connector or terminal malfunction
•  Mazda ERA-GLONASS control module connector or terminal malfunction
•  Short to power supply in wiring harness between the following terminals:
?  Mazda ERA-GLONASS control module terminal 1C and Mazda ERA-GLONASS switch terminal C
?  Mazda ERA-GLONASS control module terminal 1D and Mazda ERA-GLONASS switch terminal D
•  Open circuit in wiring harness between the following terminals:
?  Mazda ERA-GLONASS control module terminal 1C and Mazda ERA-GLONASS switch terminal C
?  Mazda ERA-GLONASS control module terminal 1D and Mazda ERA-GLONASS switch terminal D
•  Mazda ERA-GLONASS switch malfunction
•  Mazda ERA-GLONASS control module malfunction

Diagnostic Procedure

Step

Inspection

Action
1
INSPECT MAZDA ERA-GLONASS SWITCH CONNECTOR CONDITION
•  Switch the ignition off.
•  Disconnect the negative battery terminal.
•  Disconnect the Mazda ERA-GLONASS switch connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 6.
2
INSPECT MAZDA ERA-GLONASS CONTROL MODULE CONNECTOR CONDITION
•  Disconnect the Mazda ERA-GLONASS control module connector.
•  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
•  Is the connector normal?
Yes
Go to the next step.
No
Repair or replace the connector, then go to Step 6.
3
INSPECT MAZDA ERA-GLONASS SWITCH CIRCUIT FOR SHORT TO POWER SUPPLY
•  Verify that the Mazda ERA-GLONASS switch and Mazda ERA-GLONASS control module connectors are disconnected.
•  Connect the negative battery terminal.
•  Switch the ignition ON (engine off or on)
•  Measure the voltage at the following terminals (wiring harness-side).
?  Mazda ERA-GLONASS control module terminal 1C
?  Mazda ERA-GLONASS control module terminal 1D
•  Is the voltage 0 V?
Yes
Go to the next step.
No
Refer to the wiring diagram and verify if there is a common connector between the following terminals.
•  Mazda ERA-GLONASS control module terminal 1C and Mazda ERA-GLONASS switch terminal C
•  Mazda ERA-GLONASS control module terminal 1D and Mazda ERA-GLONASS switch terminal D
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for short to power supply to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which is shorted to power supply.
Go to Step 6.
4
INSPECT MAZDA ERA-GLONASS SWITCH CIRCUIT FOR OPEN CIRCUIT
•  Verify that the Mazda ERA-GLONASS switch and Mazda ERA-GLONASS control module connectors are disconnected.
•  Switch the ignition off.
•  Disconnect the negative battery terminal.
•  Inspect for continuity between the following terminals (wiring harness-side).
?  Mazda ERA-GLONASS control module terminal 1C and Mazda ERA-GLONASS switch terminal C
?  Mazda ERA-GLONASS control module terminal 1D and Mazda ERA-GLONASS switch terminal D
•  Is there continuity?
Yes
Go to the next step.
No
Refer to the wiring diagram and verify if there is a common connector between the following terminals.
•  Mazda ERA-GLONASS control module terminal 1C and Mazda ERA-GLONASS switch terminal C
•  Mazda ERA-GLONASS control module terminal 1D and Mazda ERA-GLONASS switch terminal D
If there is a common connector:
•  Inspect the common connector and terminals for corrosion, damage, or disconnection and the common wiring harnesses for an open circuit to determine the malfunctioning location.
•  Repair or replace the malfunctioning location.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
Go to Step 6.
5
INSPECT MAZDA ERA-GLONASS SWITCH
•  Inspect the Mazda ERA-GLONASS switch.
•  Is the Mazda ERA-GLONASS switch normal?
Yes
Go to the next step.
No
Replace the Mazda ERA-GLONASS switch, then go to the next step.
(See MAZDA ERA-GLONASS SWITCH REMOVAL/INSTALLATION.)
6
VERIFY THAT REPAIRS HAVE BEEN COMPLETED
•  Always reconnect all disconnected connectors.
•  Reconnect the negative battery terminal.
•  Clear the DTC for the Mazda ERA-GLONASS control module using the M-MDS.
•  Switch the ignition ON (engine off or on) and wait for 25 s or more.
•  Perform the DTC inspection for the Mazda ERA-GLONASS control module using the M-MDS.
•  Is the same DTC displayed?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the Mazda ERA-GLONASS control module.
Go to the next step.
No
Go to the next step.
7
VERIFY IF OTHER DTCs DISPLAYED
•  Are any other DTCs displayed?
Yes
Repair the malfunctioning location according to the applicable DTC troubleshooting.
(See DTC TABLE [MAZDA ERA-GLONASS CONTROL MODULE])
No
DTC troubleshooting completed.