B254C

B254C-TONNEAU EXTEND LIMIT SWITCH PERFORMANCE






For a complete wiring diagram Consult Diagrams/Electrical.

- When Monitored:
With the Ignition Switch in the on position and the Power Top Control Module (PTCM) is awake.

- Set Condition:
This code will set when there is a timeout in the roof sequence because the Tonneau Extended Limit Switch is open for at least 40 ms.







Diagnostic Test


1. TEST FOR INTERMITTENT CONDITION
Turn the ignition on.
With the scan tool, record and erase all PTCM DTC's.
Try to operate the Power Top Switch.
Wait 30 seconds.
With the scan tool, read all PTCM DTC's.
Does the scan tool display this DTC as active?

Yes

- Go to 2

No

- The condition that caused this symptom is currently not present. Check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also, inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals. Repair as necessary.
- Perform BODY VERIFICATION TEST - VER 1.Body Verification Test


2. TONNEAU EXTENDED LIMIT SWITCH

Using the scan tool, under "Miscellaneous Functions", "Manual Top Movement" move the Tonneau to the middle position between Extended and Retracted.
Turn the ignition off.
Disconnect the Tonneau Extended Limit Switch harness connector.
Connect an Ohmmeter between the leads of the Tonneau Extended Limit Switch.
Physically toggle the Tonneau Extended Limit Switch and observe the Ohmmeter.

Does the Tonneau Extended Limit Switch change states when toggled?

YES
Go To 3.

NO
Replace the Tonneau Extended Limit Switch in accordance with the Service Information. Perform BODY VERIFICATION TEST - VER 1.Body Verification Test



3. (Q982) TONNEAU LIMIT SWITCH EXTENDED SIGNAL CIRCUIT SHORTED TO VOLTAGE






Disconnect the PTCM C1 harness connector.
Disconnect the Tonneau Extended Limit Switch harness connector.
Turn the ignition on.
Measure the voltage of the (Q982) Tonneau Limit Switch Extended Signal circuit in the Tonneau Extended Limit Switch harness connector.
Is there any voltage present?

Yes

- Repair the (Q982) Tonneau Limit Switch Extended Signal circuit for a short to voltage.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test.

No

- Go to 4

4. (Q982) TONNEAU LIMIT SWITCH EXTENDED SIGNAL CIRCUIT OPEN






Turn the ignition off.
Measure the resistance of the (Q982) Tonneau Limit Switch Extended Signal circuit between the PTCM C1 harness connector and the Tonneau Extended Limit Switch harness connector.
Does the ohm meter read open circuit?

Yes

- Repair the (Q982) Tonneau Limit Switch Extended Signal circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test.

No

- Go to 5


5. (Z916) GROUND CIRCUIT OPEN






Measure the resistance of the (Z916) Ground circuit between the PTCM C1 harness connector and the Tonneau Extended Limit Switch harness connector.

Is the resistance below 5.0 Ohms?

Yes

- Go to 6.

No

- Repair the (Z916) Ground circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test.

6. TEST THE CONVERTIBLE TOP

Re-connnect all switches and the PTCM module connectors.
Turn the ignition on.
With the scan tool, erase all PTCM DTCs.
Retract and Extend the Tonneau several times.
With the scan tool, read DTCs.

Does the scan tool display: B254C-TONNEAU EXTENDED LIMIT SWITCH PERFORMANCE as "Active"?

Yes

- Replace the Power Top Control Module in accordance with the Service Information.
- Perform BODY VERIFICATION TEST - VER 1. Body Verification Test.

No

- Replace the Tonneau Extended Limit Switch in accordance with the Service Information. In order to set this code the switch was evidently stuck but was freed when it was toggled.
- Perform BODY VERIFICATION TEST - VER 1.Body Verification Test