Operation CHARM: Car repair manuals for everyone.

Pinpoint Test F: DTC B2A20




Steering Column Switches

Pinpoint Test F: DTC B2A20

Refer to Wiring Diagram Set 13, Power Distribution/SJB for schematic and connector information. [1][2]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. A microprocessor in the Smart Junction Box (SJB) monitors the voltage output from the ignition switch while the switch is in the START position. This microprocessor is also connected to the Audio Control Module (ACM) start circuit, so a short to voltage on the ignition switch output circuit or on the ACM (Audio Control Module) start circuit could cause DTC B2A20 to set.

- B2A20 (Ignition Stuck in START)- The SJB (Smart Junction Box) continuously monitors the ignition switch state, if the SJB (Smart Junction Box) receives a START signal 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)

- PCM

- ACM (Audio Control Module)

PINPOINT TEST F : DTC B2A20

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

NOTE: Verify that battery voltage is 10 volts or greater.

F1 CHECK THE IGNITION SWITCH MECHANICAL FUNCTION

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

Did the ignition switch pass the component test?

Yes
GO to F2.

No
INSTALL a new ignition switch. REFER to Ignition Switch . CLEAR the DTCs. REPEAT the self-test.

F2 CHECK THE IGNITION SWITCH ELECTRICAL FUNCTION

- Ignition OFF.

- Disconnect: Ignition Switch C250.

- Carry out the Ignition Switch component test. Component Tests and General Diagnostics

Did the ignition switch pass the component test?

Yes
GO to F3.

No
INSTALL a new ignition switch. REFER to Ignition Switch . CLEAR the DTCs. REPEAT the self-test.

F3 CHECK THE SJB (Smart Junction Box) START POWER OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE

- Connect: Ignition Switch C250.

- Disconnect: SJB (Smart Junction Box) Fuse 28 (5A).

- Ignition ON.

- Measure the voltage between SJB (Smart Junction Box) fuse 28 (5A), circuit CBP28 (GY/VT), output side and ground.





Is any voltage present?

Yes
GO to F10.

No
For non-hybrid vehicles,GO to F4.

For hybrid vehicles,GO to F9.

F4 CHECK THE SJB (Smart Junction Box) START POWER INPUT CIRCUIT FOR A SHORT TO VOLTAGE

- Measure the voltage between SJB (Smart Junction Box) fuse 28 (5A), circuit CE336 (GN/WH), input side and ground.





Is any voltage present?

Yes
GO to F5.

No
GO to F13.

F5 ISOLATE THE SJB (Smart Junction Box) START POWER CIRCUIT

- Ignition OFF.

- Disconnect: BJB (Battery Junction Box) One-Touch Integrated Start (OTIS) Diode.

- Ignition ON.

- Measure the voltage between SJB (Smart Junction Box) fuse 28 (5A), circuit CE336 (GN/WH), input side and ground.





Is any voltage present?

Yes
GO to F6.

No
GO to F8.

F6 CHECK THE PCM IGNITION SWITCH INPUT CIRCUIT FOR A SHORT TO VOLTAGE

- Ignition OFF.

- Disconnect: SJB (Smart Junction Box) C2280B.

- Ignition ON.

- Measure the voltage between SJB (Smart Junction Box) C2280B-32, circuit CE336 (GN/WH), harness side and ground.





Is any voltage present?

Yes
GO to F7.

No
GO to F13.

F7 CHECK THE PCM FOR A SHORT TO VOLTAGE

- Ignition OFF.

- Disconnect: PCM C175B.

- Ignition ON.

- Measure the voltage between SJB (Smart Junction Box) C2280B-32, circuit CE336 (GN/WH), harness side and ground.





Is any voltage present?

Yes
REPAIR circuit CE336 (GN/WH). CLEAR the DTCs. REPEAT the self-test.

No
GO to F15.

F8 CHECK THE IGNITION SWITCH START POWER OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE

- Ignition OFF.

- Disconnect: PCM C175B.

- Ignition ON.

- Measure the voltage between BJB (Battery Junction Box) 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 DTCs. REPEAT the self-test.

No
GO to F15.

F9 CHECK THE SJB (Smart Junction Box) IGNITION SWITCH INPUT CIRCUIT FOR A SHORT TO VOLTAGE

- Ignition OFF.

- Disconnect: SJB (Smart Junction Box) C2280B.

- Ignition ON.

- Measure the voltage between SJB (Smart Junction Box) C2280B-32, circuit CDC35 (BU/WH), harness side and ground.





Is any voltage present?

Yes
REPAIR circuit CDC35 (BU/WH). CLEAR the DTCs. REPEAT the self-test.

No
GO to F13.

F10 ISOLATE THE ACM (Audio Control Module)

- Ignition OFF.

- Disconnect: ACM (Audio Control Module) C240A.

- Ignition ON.

- Measure the voltage between SJB (Smart Junction Box) fuse 28 (5A), circuit CBP28 (GY/VT), output side and ground.





Is any voltage present?

Yes
GO to F11.

No
GO to F14.

F11 ISOLATE THE PCM

- Ignition OFF.

- Disconnect: PCM C175B.

- Ignition ON.

- Measure the voltage between SJB (Smart Junction Box) fuse 28 (5A), circuit CBP28 (GY/VT), output side and ground.





Is any voltage present?

Yes
GO to F12.

No
GO to F15.

F12 ISOLATE THE SJB (Smart Junction Box)

- Ignition OFF.

- Disconnect: SJB (Smart Junction Box) C2280B.

- Ignition ON.

- Measure the voltage between SJB (Smart Junction Box) C2280B-2, circuit CBP28 (GY/VT), harness side and ground.





Is any voltage present?

Yes
REPAIR circuit CBP28 (GY/VT). CLEAR the DTCs. REPEAT the self-test.

No
GO to F13.

F13 CHECK FOR CORRECT SJB (Smart Junction Box) OPERATION

- Ignition OFF.

- Disconnect: All SJB (Smart Junction Box) connectors.

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


- Connect: All SJB (Smart Junction Box) connectors making sure that 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. REPEAT the self-test.

No
The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.

F14 CHECK FOR CORRECT ACM (Audio Control Module) OPERATION

- Disconnect: All ACM (Audio Control Module) connectors.

- Check all ACM (Audio Control Module) connectors for:
- corrosion.
- pushed-out pins.
- spread terminals.


- Connect: All ACM (Audio Control Module) connectors making sure that all connectors are seated correctly.

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

Is the concern still present?

Yes
INSTALL a new ACM (Audio Control Module). CLEAR the DTCs. REPEAT the self-test.

No
The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.

F15 CHECK FOR CORRECT PCM OPERATION

- Disconnect: All PCM connectors.

- Check all PCM connectors for:
- corrosion.
- pushed-out pins.
- spread terminals.


- Connect: All PCM connectors making sure that all connectors are seated correctly.

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

Is the concern still present?

Yes
INSTALL a new PCM. CLEAR the DTCs. REPEAT the self-test.

No
The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.