Pinpoint Test 2

PINPOINT TEST 2: ONE OR MORE STOPLAMPS ARE INOPERATIVE

Normal Operation
When the brake pedal is applied, the brake pedal position switch routes voltage to the smart junction box (SJB) and the high mounted stoplamp through circuit (V/W). When the SJB detects the brake pedal is applied, the SJB provides voltage to the LH and RH rear stoplamps through circuits (GY/BR) and (V/O), respectively. If equipped with trailer tow, voltage is also routed to the LH and RH trailer tow stop/turn relays. Ground for the LH and RH rear stoplamps is provided through circuit (B/GY). Ground for the high mounted stoplamp is provided through circuit (B/W).
- DTC B2044 (Left Rear Stop Lamp Circuit Short to Ground) - is a continuous and on-demand DTC that sets when the SJB detects a short to ground on the LH rear stop/turn lamp voltage supply circuit.
- DTC B2045 (Left Rear Stop Lamp Circuit Open) - is an on-demand DTC that sets when the SJB detects an open on the LH rear stop/turn lamp voltage supply circuit.
- DTC B2046 (Right Rear Stop Lamp Circuit Short to Ground) - is a continuous and on-demand DTC that sets when the SJB detects a short to ground on the RH rear stop/turn lamp voltage supply circuit.
- DTC B2047 (Right Rear Stop Lamp Circuit Open) - is an on-demand DTC that sets when the SJB detects an open on the RH rear stop/turn lamp voltage supply circuit.

Possible Causes
- Wiring, terminals or connectors
- High mounted stoplamp
- Bulb holder
- Trailer tow stop/turn relay
- SJB

Diagnostic Procedure

CAUTION: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

NOTE:
- Make sure the bulb is good before continuing diagnostics.
- The battery ground cable must be disconnected for accurate test results when checking ground circuits for continuity to ground.

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