DTC 45: Initiator Circuit Short Detection

WARNING: This page is about a different car, the 2011 Honda Pilot, 2010 Honda Pilot, and 2009 Honda Pilot. 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.
Is there continuity?

YES - Go to step 8.

NO - Go to step 11.

Fig 1: Checking Continuity Between Body Ground & TPMS Control Unit 20P Connector Terminal No. 20
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Disconnect all four of the initiator 3P connectors.
Check for continuity between body ground and TPMS control unit 20P connector terminal No. 20.
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.

Fig 2: Checking Continuity Between Body Ground & TPMS Control Unit 20P Connector Terminal No. 20
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Plug in one initiator at a time, and check for continuity between body ground and initiator 3P connector terminal No. 1.
NOTE: Check the initiators when mounted on the vehicle.

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. ■

Fig 3: Checking Continuity Between Body Ground & Initiator 3P Connector Terminal No. 1
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Check for continuity between TPMS control unit 20P connector terminals No. 15 and No. 20.
Is there continuity?

YES - Go to step 12.

NO - Go to step 15.

Fig 4: Checking Continuity Between TPMS Control Unit 20P Connector Terminals No. 15 & No. 20
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Disconnect all four of the initiator 3P connectors.
Check for continuity between TPMS control unit 20P connector terminals No. 15 and No. 20.
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.

Fig 5: Checking Continuity Between TPMS Control Unit 20P Connector Terminals No. 15 & No. 20
Courtesy of AMERICAN HONDA MOTOR CO., INC.
On each individual initiator, check for continuity between initiator 3P connector terminals No. 1 and No. 3.
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. ■

Fig 6: Checking Continuity Between Initiator 3P Connector Terminals No. 1 & No. 3
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Turn the ignition switch to ON (II).
Measure the voltage between body ground and TPMS control unit 20P connector terminal No. 15.
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. ■

Fig 7: Measuring Voltage Between Body Ground & TPMS Control Unit 20P Connector Terminal No. 15
Courtesy of AMERICAN HONDA MOTOR CO., INC.