DTC 45: Initiator Circuit Short Detection

WARNING: This page is about a different car, the 2011 Acura TL, 2010 Acura TL, and 2009 Acura TL. However, it is still accessible from the selected car via links, so may be relevant.

Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode
Clear the DTC with the HDS
Turn the ignition switch to LOCK (0), then turn it to ON (II) again, or select the OFF mode, then the ON mode
Check for DTCs with the HDS
Is DTC 45 indicated?

YES -Go to step 5

NO -The system is OK at this time
Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode
Disconnect the TPMS control unit 20P connector

Check for continuity between body ground and the appropriate TPMS control unit 20P connector terminal

CONTINUITY REFERENCE CHART

Terminal Name	TPMS Control Unit 20P Connector Terminal
RF LF PWR	No 1
LR LF PWR	No 20
RR LF PWR	No 19
LR LF PWR	No 18

Fig 1: Checking Continuity Between Body Ground And TPMS Control Unit 20P Connector Terminal

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Go to step 8

NO -Go to step 10

Disconnect the appropriate initiator 3P connector

Check for continuity between body ground and the appropriate TPMS control unit 20P connector terminal

CONTINUITY REFERENCE CHART

Terminal Name	TPMS Control Unit 20P Connector Terminal
RF LF PWR	No 1
LR LF PWR	No 20
RR LF PWR	No 19
LR LF PWR	No 18

Fig 2: Checking Continuity Between Body Ground And TPMS Control Unit 20P Connector Terminal

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Repair short to body ground in the wire between the TPMS control unit and the appropriate initiator

NO -Replace the appropriate initiator (see INITIATOR REPLACEMENT )

Check for continuity between the appropriate TPMS control unit 20P connector terminal

CONTINUITY REFERENCE CHART

Tire Location	TPMS Control Unit 20P Connector Terminal
Right-front	RF LF PWR / No 1	RF LF GND / No 15
Left-front	LF LF PWR / No 20	LF LF GND / No 14
Right-rear	RR LF PWR / No 19	RR LF GND / No 13
Left-rear	LR LF PWR / No 18	LR LF GND / No 12

Fig 3: Checking Continuity Between TPMS Control Unit 20P Connector Terminal

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Go to step 11

NO -Go to step 13

Disconnect the appropriate initiator 3P connector

Check for continuity between the appropriate TPMS control unit 20P connector terminal

CONTINUITY REFERENCE CHART

Tire Location	TPMS Control Unit 20P Connector Terminal
Right-front	RF LF PWR / No 1	RF LF GND / No 15
Left-front	LF LF PWR / No 20	LF LF GND / No 14
Right-rear	RR LF PWR / No 19	RR LF GND / No 13
Left-rear	LR LF PWR / No 18	LR LF GND / No 12

Fig 4: Checking Continuity Between TPMS Control Unit 20P Connector Terminal

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Repair short in the wire between the TPMS control unit and the appropriate initiator

NO -Replace the appropriate initiator (see INITIATOR REPLACEMENT )

Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode

Measure the voltage between body ground and the appropriate TPMS control unit 20P connector terminal

CONTINUITY REFERENCE CHART

Terminal Name	TPMS Control Unit 20P Connector Terminal
RF LF GND	No 15
LF LF GND	No 14
RR LF GND	No 13
LR LF GND	No 12

Fig 5: Measuring Voltage Between Body Ground And TPMS Control Unit 20P Connector Terminal

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?

YES -Repair short to power in the wire between the TPMS control unit and the appropriate initiator

NO -Check for loose terminals and poor connections at the TPMS control unit If necessary, substitute a known-good TPMS control unit (see TPMS CONTROL UNIT REPLACEMENT ) and recheck