DTC B12B7:11 [MAZDA ERA-GLONASS CONTROL MODULE]

id0902r6081200

Description	Mazda ERA-GLONASS switch (green indicator) circuit malfunction
Detection condition	• The Mazda ERA-GLONASS control module detected a short to ground 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 ground in wiring harness between Mazda ERA-GLONASS control module terminal 1C and Mazda ERA-GLONASS switch terminal C. • 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. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • Disconnect the Mazda ERA-GLONASS switch connector. (See MAZDA ERA-GLONASS SWITCH REMOVAL/INSTALLATION.) • 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.
1		No	Repair or replace the connector, then go to Step 5.
2	INSPECT MAZDA ERA-GLONASS CONTROL MODULE CONNECTOR CONDITION • Disconnect the Mazda ERA-GLONASS control module connector. (See MAZDA ERA-GLONASS CONTROL MODULE REMOVAL/INSTALLATION.) • 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.
2		No	Repair or replace the connector, then go to Step 5.
3	INSPECT MAZDA ERA-GLONASS SWITCH CIRCUIT FOR SHORT TO GROUND • Verify that the Mazda ERA-GLONASS switch and Mazda ERA-GLONASS control module connectors are disconnected. • Inspect for continuity between Mazda ERA-GLONASS control module terminal 1C (wiring harness-side) and body ground. • Is there continuity?	Yes	Refer to the wiring diagram and verify if there is a common connector between Mazda ERA-GLONASS control module terminal 1C and Mazda ERA-GLONASS switch terminal C. 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 ground 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 ground. Go to Step 5.
3		No	Go to the next step.
4	INSPECT MAZDA ERA-GLONASS SWITCH • Inspect the Mazda ERA-GLONASS switch. (See MAZDA ERA-GLONASS SWITCH INSPECTION.) • Is the Mazda ERA-GLONASS switch normal?	Yes	Go to the next step.
4		No	Replace the Mazda ERA-GLONASS switch, then go to the next step. (See MAZDA ERA-GLONASS SWITCH REMOVAL/INSTALLATION.)
5	VERIFY THAT REPAIRS HAVE BEEN COMPLETED • Always reconnect all disconnected connectors. • Reconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • Clear the DTC for the Mazda ERA-GLONASS control module using the M-MDS. (See CLEARING DTC [MAZDA ERA-GLONASS CONTROL MODULE]) • 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. (See DTC INSPECTION [MAZDA ERA-GLONASS CONTROL MODULE]) • Is the same DTC displayed?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the Mazda ERA-GLONASS control module. (See MAZDA ERA-GLONASS CONTROL MODULE REMOVAL/INSTALLATION.) Go to the next step.
5		No	Go to the next step.
6	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])
6		No	DTC troubleshooting completed.