Diagnostic Test
- CHECK FOR ACTIVE DTC
- With the scan tool, record and erase DTCs.
- Cycle the ignition switch from off to on, leaving the ignition on for a minimum of 30 seconds.
- With the scan tool, read the active DTCs.
Does the scan tool display this DTC as active?
Yes
- Go to step 2
No
- If the DTC is stored, check for an intermittent condition. Using the wiring diagram/schematic as a guide, visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.
- Perform BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .
- POWERTRAIN CONTROL MODULE (NGC)
- Turn the ignition off.
- Disconnect the Powertrain Control Module C1 harness connector.
- Turn the ignition on, wait 30 seconds.
- With the scan tool, read TIPM DTCs.
Did DTC B2188-IGNITION START CONTROL CIRCUIT LOW change from active to stored?
Yes
- Replace the Powertrain Control Module in accordance with the service information.
- Perform the POWERTRAIN VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
No
- Go to step 3
- (F962) FUSED IGNITION SWITCH OUTPUT (START) CIRCUIT SHORT TO GROUND
- Turn the ignition off.
- Disconnect the TIPM C5 connector.
- Measure the resistance between the (F962) Fused Ignition Switch Output (START) circuit and ground.
Is the resistance below 10K ohms?
Yes
- Repair the (F962) Fused Ignition Switch Output (START) circuit for a short to ground.
- Perform BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .
No
- Replace the TIPM in accordance with the service information.
- Perform BODY VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure .