Pinpoint Test E: DTC B2A20 - Vehicles With an Ignition Switch

Steering Column Switches

Pinpoint Test E: DTC B2A20 - Vehicles With an Ignition Switch

Refer to Wiring Diagram Set 13, Power Distribution/SJB for schematic and connector information. Diagrams By Number

Normal Operation

The ignition switch is spring loaded to automatically return to the RUN position after being placed in the START position. When the ignition switch is placed in START, fused ignition voltage is sent to the One-Touch Integrated Start (OTIS) diode in the Battery Junction Box (BJB) and the PCM along circuit CDC35 (BU/WH). From the OTIS (One-Touch Integrated Start) diode, the voltage is sent to the Smart Junction Box (SJB), the PCM and the starter relay in the BJB (Battery Junction Box) along circuit CE336 (GN/WH).

- DTC B2A20 (Ignition Stuck in START)- The SJB (Smart Junction Box) continuously monitors the ignition switch state, if the SJB (Smart Junction Box) detects voltage on circuit CE336 (GN/WH) for more than 30 seconds, DTC B2A20 will be set.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors

- Ignition switch

- SJB (Smart Junction Box)

PINPOINT TEST E : B2A20 - VEHICLES WITH AN IGNITION SWITCH

NOTICE: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multi-meter probes.

E1 VERIFY THE IGNITION SWITCH MECHANICAL FUNCTION

- Inspect the ignition switch for mechanical function. Refer to Ignition Switch- Mechanical component test. Component Tests and General Diagnostics

Is the ignition switch OK?

Yes
GO to E2.

No
INSTALL a new ignition switch. REFER to Ignition Switch . CLEAR the DTC. TEST the system for normal operation. RETRIEVE any DTCs.

E2 ISOLATE THE IGNITION SWITCH

- Carry out the ignition switch component test.

Is the ignition switch OK?

Yes
GO to E3.

No
INSTALL a new ignition switch. REFER to Ignition Switch . CLEAR the DTC. TEST the system for normal operation. RETRIEVE any DTCs.

E3 CHECK THE IGNITION START CIRCUIT FOR A SHORT TO VOLTAGE

- Ignition OFF.

- Disconnect: Ignition Switch C250.

- Disconnect: PCM C175B.

- Disconnect: OTIS (One-Touch Integrated Start) Diode.

- Ignition ON.

- Measure the voltage between the OTIS (One-Touch Integrated Start) diode, circuit CDC35 (BU/WH), input side and ground.





Is any voltage present?

Yes
REPAIR circuit CDC35 (BU/WH). CLEAR the DTC. TEST the system for normal operation. RETRIEVE any DTCs.

No
GO to E4.

E4 CHECK THE PCM START CIRCUIT FOR A SHORT TO VOLTAGE

- Measure the voltage between the OTIS (One-Touch Integrated Start) diode, circuit CE336 (GN/WH), output side and ground.





Is any voltage present?

Yes
REPAIR circuit CE336 (GN/WH). CLEAR the DTC. TEST the system for normal operation. RETRIEVE any DTCs.

No
GO to E5.

E5 CHECK FOR CORRECT SJB (Smart Junction Box) OPERATION

- Disconnect all SJB (Smart Junction Box) connections.

- Check all SJB (Smart Junction Box) connections for:
- corrosion.
- pushed-out pins.
- spread terminals.


- Connect all the SJB (Smart Junction Box) connections and make sure they are seated correctly.

- Operate the system and verify the concern is still present.

Is the concern still present?

Yes
INSTALL a new SJB (Smart Junction Box). CLEAR the DTCs. TEST the system for normal operation.

No
The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector.