DTC 45: Initiator Circuit Short Detection

WARNING: This page is about a different car, the 2009 Acura MDX, 2008 Acura MDX, and 2007 Acura MDX. However, it is still accessible from the selected car via links, so may be relevant.

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Turn the ignition switch to LOCK (0), then turn the ignition switch to ON (II) again.
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).
Disconnect the TPMS control unit 20P connector.
Check for continuity between body ground and TPMS control unit 20P connector terminal No. 20.

Fig 1: Identifying Continuity Between Body Ground And TPMS Control Unit 20P Connector Terminal No. 20
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Go to step 8.

NO - Go to step 11.
Disconnect all four of the initiator 3P connectors.
Check for continuity between body ground and TPMS control unit 20P connector terminal No. 20.

Fig 2: Identifying Continuity Between Body Ground And TPMS Control Unit 20P Connector Terminal No. 20
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 initiators.

NO - Go to step 10.
On each individual initiator, check for continuity between body ground and initiator 3P connector terminal No. 1.
NOTE: Check the initiators when mounted on the vehicle.

Fig 3: Identifying Continuity Between Body Ground And Initiator 3P Connector Terminal No. 1
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Replace the appropriate initiator (see INITIATOR REPLACEMENT ).

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.
Check for continuity between TPMS control unit 20P connector terminals No. 15 and No. 20.

Fig 4: Identifying Continuity Between TPMS Control Unit 20P Connector Terminals No. 15 And No. 20
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Go to step 12.

NO - Go to step 15.
Disconnect all four of the initiator 3P connectors.
Check for continuity between TPMS control unit 20P connector terminals No. 15 and No. 20.

Fig 5: Identifying Continuity Between TPMS Control Unit 20P Connector Terminals No. 15 And No. 20
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Repair short in the wire between TPMS control unit 20P connector terminals No. 15 (LF GND line) and No. 20 (LF PWR. line).

NO - Go to step 14.
On each individual initiator, check for continuity between initiator 3P connector terminals No. 1 and No. 3.

Fig 6: Identifying Continuity Between Initiator 3P Connector Terminals No. 1 And No. 3
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Replace the appropriate initiator (see INITIATOR REPLACEMENT ).

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.
Turn the ignition switch to ON (II).
Measure voltage between body ground and TPMS control unit 20P connector terminal No. 15.

Fig 7: Identifying Voltage Between Body Ground And TPMS Control Unit 20P Connector Terminal No. 15
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 initiators.

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.