Pinpoint Test D: B1A01:12, B1A01:13
- Refer to WARNING DEVICES
for schematic and connector information.
Normal Operation and Fault Conditions
The PACM controls the front sounder output on hardwired circuitry and sets Diagnostic Trouble Codes (DTCs) when a circuit or sounder fault is detected.
DTC Fault Trigger Conditions
DTC Description Fault Trigger Condition PACM B1A01:12 Speaker #1: Circuit Short To Battery An on-demand DTC that sets when the PACM detects the front sounder signal or return circuits are shorted to voltage. PACM B1A01:13 Speaker #1: Circuit Open An on-demand DTC that sets when the PACM detects the front sounder signal or return circuit is open. Possible Sources
- Wiring, terminals or connectors
- Front sounder
- PACM
Visual Inspection and Pre-checks
- Inspect the sounder connector for corrosion (install new connector or terminals - clean module pins)
- Inspect the sounder connector for damaged or bent pins - install new terminals/pins
- Inspect the sounder connector for pushed-out pins - install new pins as necessary
- D1 PERFORM THE PACM (PEDESTRIAN ALERT CONTROL MODULE) MODULE SELF-TEST
- Ignition ON.
- Using a diagnostic scan tool, perform the PACM module self-test.
- Check for recorded Diagnostic Trouble Codes (DTCs) from the PACM module self-test.
Is DTC B1A01:12 recorded?
Yes GO to D2 No GO to D4 - D2 CHECK FOR A SHORT TO VOLTAGE AT THE SOUNDER
- Ignition OFF.
- Disconnect PACM C2828.
- Ignition ON.
- Measure:
Lead 1 Measurement / Action Lead 2 C2828-9 Ground
Is any voltage present?
Yes GO to D3 No GO to D7 - D3 CHECK FOR A SHORT TO VOLTAGE WITH THE SOUNDER DISCONNECTED
- Ignition OFF.
- Disconnect Sounder C1945 (DTC B1A01:12).
- Measure:
Lead 1 Measurement / Action Lead 2 C2828-9 Ground
- Ignition ON.
Is any voltage present?
Yes REPAIR the signal circuit. No REPAIR the return circuit. - D4 CHECK THE SOUNDER FOR AN OPEN
- Ignition OFF.
- Disconnect Sounder C1945 (DTC B1A01:13).
- Ignition ON.
- Using a diagnostic scan tool, perform the PACM module self-test.
-
NOTE: DTC B1A01:13 can also be present when carrying out this step and should be disregarded at this time.
Check for recorded Diagnostic Trouble Codes (DTCs) from the PACM module self-test.
Is DTC B1A01:11 recorded?
Yes REMOVE the fused jumper wire. INSTALL a new sounder. REFER to: Pedestrian Alert System Speaker . . No REMOVE the fused jumper wire. GO to D5 - D5 CHECK THE SOUNDER SIGNAL CIRCUIT FOR AN OPEN
- Ignition OFF.
- Disconnect PACM C2828.
Is the resistance less than 3 ohms?
Yes GO to D6 No REPAIR the circuit in question. - D6 CHECK THE SOUNDER RETURN CIRCUIT FOR AN OPEN
Is the resistance less than 3 ohms?
Yes GO to D7 No REPAIR the circuit in question. - D7 CHECK FOR CORRECT PACM (PEDESTRIAN ALERT CONTROL MODULE) OPERATION
- Ignition OFF.
- Disconnect and inspect the PACM and connector.
- Repair:
- corrosion (install new connector or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary
- Reconnect the PACM connector. Make sure it seats and latches correctly.
- Operate the system and determine if the concern is still present.
Is the concern still present?
Yes CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new PACM. REFER to: Pedestrian Alert Control Module (PACM) . No The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.