Diagnostic Test

1) TEST FOR INTERMITTENT CONDITION
Turn the ignition on.

With the scan tool, clear all DTC's

Turn the Stop Lamps on.

With the scan tool, read DTC's.

Does the scan tool display active: B16B1-LEFT STOP LAMP CONTROL CIRCUIT HIGH?

Yes
1. Go to 2).
No
1. 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.
2. Perform BODY VERIFICATION TEST - VER 1 .
2) CHECK (Z910) GROUND CIRCUITS
Turn the ignition off.

Disconnect the Left Rear Tail Lamp harness connector.

With a 12-volt test light connected to 12-volts, probe each (Z910) Ground circuit.

Does the test light illuminate brightly on each ground circuit?

Yes
1. Go to 4).
No
1. Go to 3).
3) (Z910) GROUND CIRCUIT OPEN
Measure the resistance of the appropriate (Z910) Ground circuit(s) at the Left Rear Tail Lamp assembly harness connector.

Is the resistance below 10.0 ohms?

Yes
1. Replace the Inoperative bulb in accordance with the Service Information.
2. Perform BODY VERIFICATION TEST - VER 1 .
No
1. Repair the appropriate (Z910) Ground circuit(s) for an open.
2. Perform BODY VERIFICATION TEST - VER 1 .
4) CHECK (L53) LEFT STOP LAMP CONTROL CIRCUIT
Turn the ignition on.

With the Stop Lamps still on and a 12-volt test light connected to ground, check the (L53) Left Stop Lamp Control circuit.

Does the test light illuminate brightly?

Yes
1. Replace the Inoperative bulb in accordance with the Service Information.
2. Perform BODY VERIFICATION TEST - VER 1 .
No
1. Go to 5).
5) (L53) LEFT STOP LAMP CONTROL CIRCUIT OPEN
Disconnect the TIPM C7 harness connector.

Measure the resistance of the (L53) Left Rear Turn Signal Control circuit between the Left Rear Tail Lamp harness connector and the TIPM C7 harness connector.

Is the resistance below 10.0 ohms?

Yes
1. Go to 6).
No
1. Repair the (L53) Turn Signal Control circuit for an open.
2. Perform BODY VERIFICATION TEST - VER 1 .
6) (L53) LEFT STOP LAMP CONTROL CIRCUIT SHORTED TO VOLTAGE
Turn the ignition on.

Measure for voltage on the (L53) Left Stop Lamp Control circuit.

Is there any voltage present?

Yes
1. Repair the (L53) Left Stop Lamp Control circuit for a short to voltage.
2. Perform BODY VERIFICATION TEST - VER 1 .
No
1. Replace the Totally Integrated Power Module (TIPM) in accordance with the Service Information.
2. Perform BODY VERIFICATION TEST - VER 1 .